diff --git "a/17 \345\221\250\345\257\214/20230313\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232.md" "b/17 \345\221\250\345\257\214/20230313\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232.md"
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index 0000000000000000000000000000000000000000..7a4e6d7333683e99d81781f48fd6280f255dbe5e
--- /dev/null
+++ "b/17 \345\221\250\345\257\214/20230313\347\254\254\345\205\255\346\254\241\344\275\234\344\270\232.md"	
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+~~~sql
+
+create database zzz charset utf8;
+use zzz;
+REATE TABLE `stuinfo`  (
+  `stuno` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `stuname` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `stuage` int(11) NULL DEFAULT NULL,
+  `stuaddress` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `stuseat` int(11) NULL DEFAULT NULL,
+  `stusex` int(11) NULL DEFAULT NULL,
+  INDEX `stuno`(`stuno`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+CREATE TABLE `stuexam`  (
+  `examno` int(11) NULL DEFAULT NULL,
+  `stuno` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `writtenexam` int(11) NULL DEFAULT NULL,
+  `labexam` int(11) NULL DEFAULT NULL,
+  INDEX `stuno`(`stuno`) USING BTREE,
+  CONSTRAINT `stuexam_ibfk_1` FOREIGN KEY (`stuno`) REFERENCES `stuinfo` (`stuno`) ON DELETE RESTRICT ON UPDATE RESTRICT
+) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+insert into stuinfo values 
+('s2501','张秋利',20,'美国硅谷',1,1),
+('s2502','李斯文',18,'湖北武汉',2,0),
+('s2503','马文才',22,'湖南长沙',3,1),
+('s2504','欧阳俊雄',21,'湖北武汉',4,0),
+('s2505','梅超风',20,'湖北武汉',5,1),
+('s2506','陈旋风',19,'美国硅谷',6,1),
+('s2507','陈风',20,'美国硅谷',7,0);
+INSERT into stuexam VALUES
+(1,'s2501',50,70),
+(2,'s2502',60,65),
+(3,'s2503',86,85),
+(4,'s2504',40,80),
+(5,'s2505',70,90),
+(6,'s2506',85,90);
+-- 1.查询学生信息表（stuinfo）中所有列信息，给每列取上中文名称
+select stuno 学号,stuname 姓名,stuage 年龄,stuaddress 地址,stuseat 座号, stusex 性别 from stuinfo;
+-- 2.查询学生信息表（stuinfo）中的姓名，年龄和地址三列的信息
+ select stuname 姓名,stuage 年龄,stuaddress 地址 from stuinfo;
+-- 3.查询学生分数表（stuexam）中的学号，笔试和机试三列的信息，并为这三列取中文名字
+select  stuno 学号, writtenexam 笔试, labexam 机试 from stuexam ;
+-- 5.查询学生分数表（stuexam）中的学生的学号，笔试，机试以及总分这四列的信息
+select  stuno 学号, writtenexam 笔试, labexam 机试,(writtenexam + labexam)总分 from stuexam;
+-- 6.查询学生信息表（stuInfo）中学生来自哪几个地方 
+select distinct stuaddress from stuinfo;
+-- 7.查询学生信息表（stuInfo）中学生有哪几种年龄，并为该列取对应的中文列名
+ select distinct stuage 年龄 from stuinfo;
+-- 8.查询学生信息表（stuInfo）中前3行记录 
+select * from stuinfo where stuno in('s2501','s2502','s2503');
+-- 9.查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+select stuname,stuseat from stuinfo where stuseat in(1,2,3,4);
+-- 11.将地址是湖北武汉，年龄是20的学生的所有信息查询出来
+select * from stuinfo where stuaddress = '湖北武汉' and stuage = 20; 
+-- 12.将机试成绩在60-80之间的信息查询出来，并按照机试成绩降序排列
+select * from stuexam where labexam between 60 and 80 order by labexam desc; 
+-- 13.查询来自湖北武汉或者湖南长沙的学生的所有信息
+select * from stuinfo where stuaddress = '湖北武汉' or stuaddress = '湖南长沙'; 
+-- 14.查询出笔试成绩不在70-90之间的信息,并按照笔试成绩升序排列
+select * from stuexam where writtenexam not between 70 and 90 order by writtenexam; 
+-- 15.查询年龄没有写的学生所有信息
+select * from stuinfo where stuage is null; 
+-- 16.查询年龄写了的学生所有信息
+select * from stuinfo where stuage is not null;
+-- 17.查询姓张的学生信息
+select * from stuinfo where stuname like '张%';  
+-- 18.查询学生地址中有‘湖’字的信息
+select * from stuinfo where stuaddress like '%湖%'; 
+-- 19.查询姓张但名为一个字的学生信息
+select * from stuinfo where stuname like '张_';  
+-- 20.查询姓名中第三个字为‘俊’的学生的信息，‘俊’后面有多少个字不限制
+select * from stuinfo where stuname like '__俊%';
+-- 21.按学生的年龄降序显示所有学生信息
+select * from stuinfo order by stuage desc;
+-- 22.按学生的年龄降序和座位号升序来显示所有学生的信息
+select * from stuinfo order by stuage desc,stuseat asc;
+-- 23显示笔试第一名的学生的考试号，学号，笔试成绩和机试成绩
+select examno,stuno,max(writtenexam),labexam from stuexam ; 
+-- 24.显示机试倒数第一名的学生的考试号，学号，笔试成绩和机试成绩
+select examno,stuno,writtenexam,min(labexam) from stuexam ;
+-- 25.查询每个地方的学生的平均年龄
+select stuaddress,avg(stuage) 平均年龄 from stuinfo GROUP BY stuaddress; 
+-- 26.查询男女生的分别的年龄总和
+select stusex,sum(stuage) 年龄总和 from stuinfo GROUP BY stusex;
+-- 27.查询每个地方的男女生的平均年龄和年龄的总和
+select stuaddress,avg(stuage) 平均年龄,stusex,sum(stuage) 年龄总和 from stuinfo GROUP BY stuaddress,stusex; 
+
+
+
+
+
+
+
+
+
+
+
+
+~~~
+