diff --git "a/44 \344\273\243\347\221\236/MySQL\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232DQl.md" "b/44 \344\273\243\347\221\236/MySQL\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232DQl.md"
new file mode 100644
index 0000000000000000000000000000000000000000..cfebab3ab104404c37b3062ebc17a63f1c32f9ff
--- /dev/null
+++ "b/44 \344\273\243\347\221\236/MySQL\347\254\254\344\270\211\346\254\241\344\275\234\344\270\232DQl.md"	
@@ -0,0 +1,96 @@
+## 第一题
+
+
+
+create database if not exists ai charset utf8;
+use ai;
+drop table if exists `employee`;
+CREATE TABLE employee(
+	id INT,
+	`name` VARCHAR(20),
+	sex VARCHAR(20),
+	tel VARCHAR(20),
+	addr VARCHAR(50),
+	salary FLOAT
+);
+INSERT INTO employee(id,`name`,sex,tel,addr,salary)VALUES
+(10001,'张一一','男','13456789000','广东韶关',10010.58),
+(10002,'刘小红','女','13454319000','广东江门',12010.21),
+(10003,'李四','男','0751-1234567','广东佛山',10040.11),
+(10004,'刘小强','男','0755-5555555','广东深圳',15010.23),
+(10005,'王艳','男',NULL,'广东广州',14050.16);
+select *from employee where salary between 1200 and 1300;
+select id,name,addr from employee where name like '刘%';
+update employee set addr='广东韶关' where name='李四';
+select *from employee where name like '%小%'; 
+select*from employee where salary>11000 and sex='男';
+select*from employee where tel is null; 
+select *from employee where salary>12000 && sex='男';
+select name 名字,salary 薪 from employee;
+
+## 第二题
+
+create database if not exists ni charset utf8;
+use ni;
+DROP TABLE IF EXISTS `countries_info`;
+CREATE TABLE `countries_info`(
+	`name` VARCHAR(100),
+	`continent` VARCHAR(100),
+	`area` INT,
+	population INT,
+	gdp BIGINT
+);
+INSERT INTO countries_info VALUES
+('Afghanistan','Asia',652230,25500100,20343000000),
+('Albania','Europe',28748,2831741,12960000000),
+('Algeria','Africa',2381741,37100000,188681000000),
+('Andorra','Europe',468,78115,3712000000),
+('Angola','Africa',1246700,20609294,100990000000);
+-- **要求1：** 查询大国 的国家名称、人口和面积。
+select name,continent,area,population from countries_info where area>=3000000 or population>=25000000; 
+
+-- 如果一个国家满足下述两个条件之一，则认为该国是 大国 ：
+--
+
+-- - 面积至少为 300万平方公里（即，3000000 km2）
+select *from countries_info where area>=3000000;
+-- - 人口至少为 2500 万（即 25000000）
+select *from countries_info where population >=25000000;
+-- **要求2：**查询属于亚洲的国家名称、所属大陆、面积、人口和 GDP 值
+select * from countries_info where continent= 'Asia'; 
+-- **要求3：**查询国土面积不足1万平方公里且人口不走10万人的国家信息
+ select * from countries_info where area<10000 and population<100000;
+-- **要求4：**查询国家名字中包含“o“字母的国家信息
+select * from countries_info where name like '%o%';
+-- **要求5：**查询GDP值超过10000000000的国家信息
+select * from countries_info where gdp>10000000000; 
+
+-- **要求6：**查询每个国家的人均贡献GDP值（GDP/人口总数）并显示为“国家名、人口、GDP值、人均贡献GDP值”
+-- 
+
+select name '国家名', population '人口', gdp 'GDP值',gdp/ population '人均贡献GDP值' from countries_info;
+
+-- **要求7：**查询人均贡献GDP值低于1000的国家信息。
+-- 
+
+select * from countries_info where gdp / population < 1000;
+
+-- **要求8：**查询每个国家的人均国土面积（面积/人口总数）并显示为“国家名、面积、人口、人均国土面积值”
+
+select name '国家名',area '面积', population '人口',area/ population '人均国土面积值' from countries_info;
+
+## 笔记
+
+查询内容：select*from 表名
+
+select 字段列表 from 表名 where 条件；
+
+别名：select 字段名1 as ‘ 别名1’，字段名2 as  ‘别名2’from表名称 as 别名
+
+去重：select distinct 字段列表from 表名 where；
+
+select distinct did from t_employee;
+
+查某个带。。。。：select * from countries_info where name like '%o%';
+
+%:表示任意个数    —：一个下划线表示一个  用    like
\ No newline at end of file
diff --git "a/44 \344\273\243\347\221\236/\350\201\232\345\220\210\345\207\275\346\225\260.md" "b/44 \344\273\243\347\221\236/\350\201\232\345\220\210\345\207\275\346\225\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..edcd90bc375efb6567649979cf9fb45c4bbf3447
--- /dev/null
+++ "b/44 \344\273\243\347\221\236/\350\201\232\345\220\210\345\207\275\346\225\260.md"	
@@ -0,0 +1,172 @@
+| Avg()平均值 Sum()求和 Max()最大值 |                                                              |                                                              |
+| --------------------------------- | ------------------------------------------------------------ | ------------------------------------------------------------ |
+|                                   | [4](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_4) |                                                              |
+|                                   | [5](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_5) | Min()最小值 count()统计记录器                                |
+|                                   | [6](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_6) |                                                              |
+|                                   | [7](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_7) | count（**）统计全部,count**(字段)统计非null的值              |
+|                                   | [8](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_8) |                                                              |
+|                                   | [9](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_9) | 关联查询                                                     |
+|                                   | [10](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_10) |                                                              |
+|                                   | [11](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_11) | 内连接：a inner join b on a.字段=b.字段 ab相同数据           |
+|                                   | [12](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_12) |                                                              |
+|                                   | [13](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_13) | 左全连接：a left join b on a.字段=b.字段 where a.字段 is null 不重复的a数据 |
+|                                   | [14](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_14) |                                                              |
+|                                   | [15](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_15) | 右全连接：a right join b on a.字段=b.字段 where b.字段 is null 不重复的b数据 |
+|                                   | [16](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_16) |                                                              |
+|                                   | [17](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_17) | 左连接：a left join b on a.字段=b.字段  全a数据              |
+|                                   | [18](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_18) |                                                              |
+|                                   | [19](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_19) | 右连接：a right join b on a.字段=b.字段 全b数据              |
+|                                   | [20](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_20) |                                                              |
+|                                   | [21](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_21) |                                                              |
+|                                   | [22](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_22) |                                                              |
+|                                   | [23](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_23) | # 作业                                                       |
+|                                   | [24](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_24) |                                                              |
+|                                   | [25](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_25) | ```mysql                                                     |
+|                                   | [26](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_26) | ## 创建添加数据顺序 1,4,2,3                                  |
+|                                   | [27](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_27) |                                                              |
+|                                   | [28](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_28) | create database glcx charset utf8;                           |
+|                                   | [29](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_29) | use glcx;                                                    |
+|                                   | [30](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_30) | create table Student(                                        |
+|                                   | [31](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_31) | Sno	varchar (20) not null primary key,                    |
+|                                   | [32](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_32) | Sname	varchar (20) not null,                              |
+|                                   | [33](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_33) | Ssex	varchar (20) not null,                               |
+|                                   | [34](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_34) | Sbirthday	datetime,                                       |
+|                                   | [35](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_35) | Class	varchar (20)                                        |
+|                                   | [36](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_36) | );                                                           |
+|                                   | [37](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_37) | create table Course(                                         |
+|                                   | [38](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_38) | Cno	varchar (20) not null primary key,                    |
+|                                   | [39](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_39) | Cname	varchar (20) not null,                              |
+|                                   | [40](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_40) | Tno	varchar (20) not null,                                |
+|                                   | [41](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_41) | foreign key(Tno) references Teacher(Tno)                     |
+|                                   | [42](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_42) | );                                                           |
+|                                   | [43](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_43) | create table Score(                                          |
+|                                   | [44](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_44) | Sno	varchar (20) not null,                                |
+|                                   | [45](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_45) | foreign key(Sno) references Student(Sno),                    |
+|                                   | [46](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_46) | Cno	varchar (20),                                         |
+|                                   | [47](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_47) | foreign key(Cno) references Course(Cno),                     |
+|                                   | [48](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_48) | Degree	Decimal(4,1)                                       |
+|                                   | [49](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_49) | );                                                           |
+|                                   | [50](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_50) | create table Teacher(                                        |
+|                                   | [51](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_51) | Tno	varchar (20) not null primary key,                    |
+|                                   | [52](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_52) | Tname	varchar (20) not null,                              |
+|                                   | [53](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_53) | Tsex	varchar (20) not null,                               |
+|                                   | [54](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_54) | Tbirthday	datetime,                                       |
+|                                   | [55](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_55) | Prof	varchar (20),                                        |
+|                                   | [56](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_56) | Depart	varchar (20) not null                              |
+|                                   | [57](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_57) | );                                                           |
+|                                   | [58](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_58) | insert into Student values                                   |
+|                                   | [59](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_59) | (108,'曾华','男','1977-9-1',95033),                          |
+|                                   | [60](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_60) | (105,'匡明','男','1975-10-2',95031),                         |
+|                                   | [61](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_61) | (107,'王丽','女','1976-1-23',95033),                         |
+|                                   | [62](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_62) | (101,'李军','男','1976-2-20',95033),                         |
+|                                   | [63](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_63) | (109,'王芳','女','1975-2-10',95031),                         |
+|                                   | [64](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_64) | (103,'陆君','男','1974-6-3',95031);                          |
+|                                   | [65](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_65) | insert into Course VALUES                                    |
+|                                   | [66](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_66) | ('3-105','计算机导论',825),                                  |
+|                                   | [67](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_67) | ('3-245','操作系统',804),                                    |
+|                                   | [68](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_68) | ('6-166','数字电路',856),                                    |
+|                                   | [69](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_69) | ('9-888','高等数学',831);                                    |
+|                                   | [70](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_70) | insert into Score VALUES                                     |
+|                                   | [71](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_71) | (103,'3-245',86),                                            |
+|                                   | [72](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_72) | (105,'3-245',75),                                            |
+|                                   | [73](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_73) | (109,'3-245',68),                                            |
+|                                   | [74](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_74) | (103,'3-105',92),                                            |
+|                                   | [75](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_75) | (105,'3-105',88),                                            |
+|                                   | [76](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_76) | (109,'3-105',76),                                            |
+|                                   | [77](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_77) | (101,'3-105',64),                                            |
+|                                   | [78](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_78) | (107,'3-105',91),                                            |
+|                                   | [79](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_79) | (108,'3-105',78),                                            |
+|                                   | [80](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_80) | (101,'6-166',85),                                            |
+|                                   | [81](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_81) | (107,'6-166',79),                                            |
+|                                   | [82](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_82) | (108,'6-166',81);                                            |
+|                                   | [83](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_83) | insert into Teacher VALUES                                   |
+|                                   | [84](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_84) | (804,'李诚','男','1958-12-2','副教授','计算机系'),           |
+|                                   | [85](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_85) | (856,'张旭','男','1969-3-12','讲师','电子工程系'),           |
+|                                   | [86](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_86) | (825,'王萍','女','1972-5-5','助教',' 计算机系'),             |
+|                                   | [87](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_87) | (831,'刘冰','女','1977-8-14','助教',' 电子工程系');          |
+|                                   | [88](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_88) |                                                              |
+|                                   | [89](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_89) | -- 1,查询所有学生，都学了哪些课程，要显示学生信息和课程信息/ |
+|                                   | [90](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_90) | 表1关联表3，表3关联表2                                       |
+|                                   | [91](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_91) | select * from Student inner join Score inner join Course on  |
+|                                   | [92](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_92) | Student.Sno=Score.Sno and Score.Cno=Course.Cno;              |
+|                                   | [93](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_93) | -- 2，查询没有学生的教师的所有信息                           |
+|                                   | [94](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_94) |                                                              |
+|                                   | [95](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_95) | -- 1.查询Score表中的最高分的学生学号和课程号。               |
+|                                   | [96](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_96) | select Sno,Cno from Score;                                   |
+|                                   | [97](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_97) | -- 2.查询所有学生的Sname、Cno和Degree列。                    |
+|                                   | [98](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_98) | select Student.Sname,Score.Cno,Score.Degree from             |
+|                                   | [99](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_99) | Score inner join Student on Student.Sno=Score.Sno;           |
+|                                   | [100](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_100) | -- 3.查询所有学生的Sno、Cname和Degree列。                    |
+|                                   | [101](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_101) | select Score.Sno,Course.Cname,Score.Degree FROM              |
+|                                   | [102](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_102) | Course inner join Score on Course.Cno=Score.Cno;             |
+|                                   | [103](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_103) | -- 4.查询所有学生的Sname、Cname和Degree列。                  |
+|                                   | [104](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_104) | select Student.Sname,Course.Cname,Score.Degree FROM          |
+|                                   | [105](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_105) | Student inner join Score inner join Course                   |
+|                                   | [106](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_106) | on Score.Sno=Student.Sno and Score.Cno=Course.Cno;           |
+|                                   | [107](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_107) | -- 5.查询“95033”班学生的平均分。                             |
+|                                   | [108](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_108) | select round(sum(Degree) / count(Class),1) 成绩 from Student inner join Score on |
+|                                   | [109](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_109) | Score.Sno=Student.Sno where Class='95033';                   |
+|                                   | [110](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_110) | -- 6.查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。 |
+|                                   | [111](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_111) | select * from Score where Cno='3-105' and degree>(sno='109'); |
+|                                   | [112](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_112) | -- 7.查询score中选学多门课程的同学中分数为非最高分成绩的记录。 |
+|                                   | [113](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_113) |                                                              |
+|                                   | [114](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_114) | -- 8.查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。 |
+|                                   | [115](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_115) | select * from Student inner join Score inner join Course on  |
+|                                   | [116](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_116) | Student.Sno=Score.Sno and Score.Cno=Course.Cno where         |
+|                                   | [117](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_117) | (Score.Sno='109')<degree                                     |
+|                                   | [118](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_118) | and Score.Cno='3-105';                                       |
+|                                   | [119](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_119) | -- 9.查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。 |
+|                                   | [120](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_120) |                                                              |
+|                                   | [121](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_121) | -- 10.查询“张旭“教师任课的学生成绩。                         |
+|                                   | [122](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_122) | select Score.degree from Score inner join Course inner join Teacher ON |
+|                                   | [123](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_123) | Score.Cno=Course.Cno and Course.Tno=Teacher.Tno where Teacher.Tno='张旭'; |
+|                                   | [124](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_124) | -- 11.查询选修某课程的同学人数多于5人的教师姓名。            |
+|                                   | [125](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_125) |                                                              |
+|                                   | [126](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_126) | -- 12.查询出“计算机系“教师所教课程的成绩表。                 |
+|                                   | [127](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_127) | select Score.Degree from Teacher inner join Course inner join Score ON |
+|                                   | [128](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_128) | Teacher.Tno=Course.Tno and Course.Cno=Score.Cno              |
+|                                   | [129](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_129) | where Teacher.Depart='计算机系';                             |
+|                                   | [130](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_130) | -- 13.查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。 |
+|                                   | [131](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_131) | -- 14.查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。 |
+|                                   | [132](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_132) | -- 15.查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree. |
+|                                   | [133](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_133) | -- 16.查询成绩比该课程平均成绩低的同学的成绩表。             |
+|                                   | [134](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_134) | select Degree from Course inner join Score on                |
+|                                   | [135](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_135) | Score.Cno=Course.Cno                                         |
+|                                   | [136](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_136) | where                                                        |
+|                                   | [137](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_137) | Degree> (select avg(Degree) from Score);                     |
+|                                   | [138](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_138) | -- 17.查询所有任课教师的Tname和Depart.                       |
+|                                   | [139](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_139) | select tname,Depart from Teacher inner join Course on        |
+|                                   | [140](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_140) | Course.Tno=Teacher.Tno                                       |
+|                                   | [141](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_141) | where                                                        |
+|                                   | [142](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_142) | Teacher.Tno = Course.Tno;                                    |
+|                                   | [143](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_143) | -- 18.查询所有未讲课的教师的Tname和Depart.                   |
+|                                   | [144](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_144) | select tname,Depart from Teacher inner join Course on        |
+|                                   | [145](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_145) | Course.Tno=Teacher.Tno                                       |
+|                                   | [146](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_146) | where                                                        |
+|                                   | [147](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_147) | not (Teacher.Tno = Course.Tno);                              |
+|                                   | [148](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_148) | -- 19.查询“男”教师及其所上的课程。                           |
+|                                   | [149](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_149) | select Tname,Cname from Teacher inner join Course on         |
+|                                   | [150](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_150) | Teacher.Tno=Course.Tno                                       |
+|                                   | [151](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_151) | where                                                        |
+|                                   | [152](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_152) | Tsex='男';                                                   |
+|                                   | [153](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_153) | -- 20.查询最高分同学的Sno、Cno和Degree列。                   |
+|                                   | [154](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_154) | select sno,cno,Degree from Score                             |
+|                                   | [155](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_155) | WHERE                                                        |
+|                                   | [156](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_156) | (select max(Degree) from Score);                             |
+|                                   | [157](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_157) | -- 21.查询和“李军”同性别的所有同学的Sname.                   |
+|                                   | [158](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_158) | select sname from Student                                    |
+|                                   | [159](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_159) | where                                                        |
+|                                   | [160](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_160) | Ssex=(select Ssex from Student where Sname='李军');          |
+|                                   | [161](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_161) | -- 22.查询和“李军”同性别并同班的同学Sname.                   |
+|                                   | [162](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_162) | select sname from Student                                    |
+|                                   | [163](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_163) | where                                                        |
+|                                   | [164](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_164) | Ssex=(select Ssex from Student where Sname='李军')           |
+|                                   | [165](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_165) | and                                                          |
+|                                   | [166](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_166) | Class=(select Class from Student where Sname='李军');        |
+|                                   | [167](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_167) | -- 23.查询所有选修“计算机导论”课程的“男”同学的成绩表.        |
+|                                   | [168](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_168) | select Degree from Course inner join Score inner join Student on |
+|                                   | [169](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_169) | Course.Cno=Score.Cno and Score.Sno=Student.Sno               |
+|                                   | [170](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_170) | where                                                        |
+|                                   | [171](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_171) | Ssex='男'                                                    |
+|                                   | [172](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_172) | and                                                          |
+|                                   | [173](https://gitee.com/cao-zhengbo/mysql-base/commit/ae00d0192f63374ed631babaaae4014f677c6b4e#68936acdd28e239fe05f04bcc92c71e2e723d5a2_0_173) | Cname=(select Cname from Course where Cname='计算机导论') ;  |
\ No newline at end of file