diff --git "a/14 \346\235\216\344\277\212\345\205\264/20230313 \346\237\245\350\257\242\344\275\234\344\270\232.md" "b/14 \346\235\216\344\277\212\345\205\264/20230313 \346\237\245\350\257\242\344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..6d108431b80dbeb9ce5b79ddc1d1bd1cb0a379f7
--- /dev/null
+++ "b/14 \346\235\216\344\277\212\345\205\264/20230313 \346\237\245\350\257\242\344\275\234\344\270\232.md"	
@@ -0,0 +1,184 @@
+```mysql
+create database studen charset utf8;
+use studen;
+create table stuinfo(
+	stuNO varchar(11) primary key,
+	stuName varchar(11) unique key not null,
+	stuAge int not null,
+	stuAddress varchar(11) not null,
+	stuSeat int not null,
+	stuSex int not null
+);
+create table stuexam(
+	examNO int not null unique key auto_increment,
+	stuNO varchar(11) primary key,
+	writtenExam int not null,
+	labExam int not null,
+	foreign key (stuNO) references stuinfo(stuNO)
+);
+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
+
+```mysql
+select stuNO 学号,stuName 姓名,stuAge 年龄,stuAddress 地址,stuSeat 号数,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
+
+```mysql
+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
+
+```mysql
+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
+
+```mysql
+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 
+
+```mysql
+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
+
+```mysql
+select stuAge 年龄 from stuinfo group by stuAge;
+```
+
+8.查询学生信息表（stuInfo）中前3行记录 
+
+```mysql
+select * from stuinfo limit 0,3;
+```
+
+9.查询学生信息表（stuInfo）中前4个学生的姓名和座位号
+
+```mysql
+select stuName,stuSeat from stuinfo limit 0,4;
+```
+
+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
+
+```mysql
+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
+
+```mysql
+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
+
+```mysql
+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
+
+```mysql
+select * from stuexam where writtenExam not between 70 and 90 order by writtenExam asc;
+```
+
+15.查询年龄没有写的学生所有信息
+
+```mysql
+select * from stuinfo where stuAge is null;
+```
+
+16.查询年龄写了的学生所有信息
+
+```mysql
+select * from stuinfo where stuage is not null;
+```
+
+17.查询姓张的学生信息
+
+```mysql
+select * from stuinfo where stuName like '张%';
+```
+
+18.查询学生地址中有‘湖’字的信息
+
+```mysql
+select * from stuinfo where stuAddress like '%湖%';
+```
+
+19.查询姓张但名为一个字的学生信息
+
+```mysql
+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
+
+```mysql
+select * from stuinfo where stuname like '__俊%';
+```
+
+21.按学生的年龄降序显示所有学生信息
+
+```mysql
+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
+
+```mysql
+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
+
+```mysql
+select examNO,a.stuNO,writtenExam,labExam from stuinfo a right join stuexam b on a.stuno=b.stuNO where writtenExam=(select max(writtenExam) 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
+
+```mysql
+select examNO,a.stuNO,writtenExam,labExam from stuinfo a right join stuexam b on a.stuno=b.stuNO where labExam=(select min(labExam) from stuexam);
+```
+
+25.查询每个地方的学生的平均年龄
+
+```mysql
+select stuAddress,round(avg(stuAge),2) 平均年龄 from stuinfo group by stuAddress;
+```
+
+26.查询男女生的分别的年龄总和
+
+```mysql
+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
+
+```mysql
+select stuSex,round(avg(stuAge),2) 平均年龄,sum(stuAge) 年龄总和 from stuinfo group by stuSex;
+```
\ No newline at end of file
diff --git "a/14 \346\235\216\344\277\212\345\205\264/\345\244\247\344\275\234\344\270\232.md" "b/14 \346\235\216\344\277\212\345\205\264/\345\244\247\344\275\234\344\270\232.md"
new file mode 100644
index 0000000000000000000000000000000000000000..a2b144c32b1f4a27e152e5e5f705feb21ec437b7
--- /dev/null
+++ "b/14 \346\235\216\344\277\212\345\205\264/\345\244\247\344\275\234\344\270\232.md"	
@@ -0,0 +1,151 @@
+## 大作业
+
+```sql
+create DATABASE xiaoshou
+SET NAMES utf8mb4;
+SET FOREIGN_KEY_CHECKS = 0;
+
+-- ----------------------------
+-- Table structure for author
+-- ----------------------------
+DROP TABLE IF EXISTS `author`;
+CREATE TABLE `author`  (
+  `author_id` int(11) NOT NULL,
+  `author_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  `credits` int(11) NULL DEFAULT NULL,
+  `vip_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  `author_sex` char(10) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT '男',
+  PRIMARY KEY (`author_id`) USING BTREE,
+  UNIQUE INDEX `author_name`(`author_name`) USING BTREE,
+  INDEX `vip_id`(`vip_id`) USING BTREE,
+  CONSTRAINT `vip_id` FOREIGN KEY (`vip_id`) REFERENCES `vip` (`vip_id`) ON DELETE RESTRICT ON UPDATE RESTRICT
+) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of author
+-- ----------------------------
+INSERT INTO `author` VALUES (1001, '朱逸群', 600, 'VIP01', '男');
+INSERT INTO `author` VALUES (1002, '范建', 8510, 'VIP04', '男');
+INSERT INTO `author` VALUES (1003, '史珍香', 981, 'VIP02', '男');
+INSERT INTO `author` VALUES (1004, '范统', 2364, 'VIP02', '男');
+INSERT INTO `author` VALUES (1005, '杜子腾', 257, 'VIP01', '女');
+INSERT INTO `author` VALUES (1006, '刘产', 678, 'VIP02', '男');
+INSERT INTO `author` VALUES (1007, '杜琦燕', 438, 'VIP03', '女');
+
+-- ----------------------------
+-- Table structure for story
+-- ----------------------------
+DROP TABLE IF EXISTS `story`;
+CREATE TABLE `story`  (
+  `story_id` int(11) NOT NULL AUTO_INCREMENT,
+  `author_id` int(11) NULL DEFAULT NULL,
+  `type_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `story_name` varchar(40) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
+  `views_number` int(11) NULL DEFAULT NULL,
+  PRIMARY KEY (`story_id`) USING BTREE,
+  INDEX `author_id`(`author_id`) USING BTREE,
+  INDEX `type_id`(`type_id`) USING BTREE,
+  CONSTRAINT `author_id` FOREIGN KEY (`author_id`) REFERENCES `author` (`author_id`) ON DELETE RESTRICT ON UPDATE RESTRICT,
+  CONSTRAINT `type_id` FOREIGN KEY (`type_id`) REFERENCES `type` (`type_id`) ON DELETE RESTRICT ON UPDATE RESTRICT
+) ENGINE = InnoDB AUTO_INCREMENT = 12 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of story
+-- ----------------------------
+INSERT INTO `story` VALUES (1, 1002, 'L03', '母猪产后与护理师的二三事', 6541);
+INSERT INTO `story` VALUES (2, 1005, 'L04', '拖拉机大战蜘蛛侠', 663);
+INSERT INTO `story` VALUES (3, 1003, 'L01', '这只小龙虾不正经', 8754);
+INSERT INTO `story` VALUES (4, 1006, 'L04', '一个爹爹三个娃', 36354);
+INSERT INTO `story` VALUES (6, 1005, 'L05', '给长城贴瓷砖的小太监', 6541);
+INSERT INTO `story` VALUES (7, 1003, 'L03', '不科学御兽', 1257);
+INSERT INTO `story` VALUES (8, 1005, 'L01', '镜面管理局', 3216);
+INSERT INTO `story` VALUES (9, 1004, 'L02', '关于我成为灭魂师之后', 1147);
+INSERT INTO `story` VALUES (10, 1004, 'L05', '公子别秀', 2078);
+INSERT INTO `story` VALUES (11, 1005, 'L05', '拜登夸我很帅', 854);
+
+-- ----------------------------
+-- Table structure for type
+-- ----------------------------
+DROP TABLE IF EXISTS `type`;
+CREATE TABLE `type`  (
+  `type_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  `type_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  PRIMARY KEY (`type_id`) USING BTREE,
+  UNIQUE INDEX `type_name`(`type_name`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of type
+-- ----------------------------
+INSERT INTO `type` VALUES ('L04', '仙侠');
+INSERT INTO `type` VALUES ('L02', '奇幻');
+INSERT INTO `type` VALUES ('L03', '武侠');
+INSERT INTO `type` VALUES ('L01', '玄幻');
+INSERT INTO `type` VALUES ('L05', '都市');
+
+-- ----------------------------
+-- Table structure for vip
+-- ----------------------------
+DROP TABLE IF EXISTS `vip`;
+CREATE TABLE `vip`  (
+  `vip_id` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  `vip_name` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  PRIMARY KEY (`vip_id`) USING BTREE,
+  UNIQUE INDEX `vip_name`(`vip_name`) USING BTREE
+) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
+
+-- ----------------------------
+-- Records of vip
+-- ----------------------------
+INSERT INTO `vip` VALUES ('VIP02', '白银作家');
+INSERT INTO `vip` VALUES ('VIp04', '钻石作家');
+INSERT INTO `vip` VALUES ('VIP01', '青铜作家');
+INSERT INTO `vip` VALUES ('VIP03', '黄金作家');
+
+SET FOREIGN_KEY_CHECKS = 1;
+
+-- 1. 根据前面提供的表结构和表数据，创建数据库并分别创建这张四张表；并插入相关数据。(提醒：外键
+-- 请注意建表顺序和插入数据的顺序) （30分）
+-- 2. 将story 表中的story_name字段类型改成varchar(40) 。（2分）
+ALTER table story MODIFY story_name VARCHAR(40);
+-- 3. 在author表中增加一个性别字段 字段名：author_sex,类型： char(10)，要求默认值为'男'。 （3分）
+alter table author add author_sex char(10) default '男';
+-- 4. 将作家编号为1005、1007的作家性别改为'女' 。（2分）
+update  author set author_sex='女' where author_id in (1005,1007);
+-- 5. 作家杜子腾，写了一篇名为《拜登夸我很帅》的都市小说，有854个浏览量，请将这条信息插入到story
+-- 表。（3分）
+insert into story values(null,1005,'L05','拜登夸我很帅',854);
+-- 6. 《拖拉机大战蜘蛛侠》这篇小说，浏览量涨了100，请更新story表中的相关数据。（2分）
+update story  set views_number=views_number+100 where story_name='拖拉机大战蜘蛛侠';
+-- 7. 请删除story表的中《皇上滚开本宫只劫财》这篇小说相关数据。（2分）
+DELETE FROM story WHERE story_name ='皇上滚开本宫只劫财》';
+-- 8. 查询 浏览量大于 8000的小说的作者编号和小说作品名称。（2分）
+SELECT author_id 书籍编号,story_name 书名 from story WHERE views_number>8000;
+-- 9. 查询积分大于1000 并且会员等级高于vip03的作家所有信息。（3分）
+SELECT * FROM author WHERE credits >1000 and vip_id > 'vip03';
+-- 10. 查询姓名以杜字开头的作家的姓名，积分和等级编号。（3分） 
+SELECT author_name,credits,vip_id   from  author WHERE author_name like '杜%';   
+-- 11. 查询积分在100、1000之间的作家信息，以积分降序排列。 （3分）
+SELECT * from author WHERE credits BETWEEN 100 and 1000 order by  credits desc;
+-- 12. 查询出小说的总浏览量，最高浏览量，最小浏览量，平均浏览量，给字段用上中文别名。（3分）\
+SELECT  SUM(views_number) 总浏览量,MAX(views_number) 最高浏览量,AVG(views_number) 平均浏览量, MIN(views_number) 最小浏览量 FROM story;
+-- 13. 查询各种等级的作家的平均积分和作家数量,并对查询结果使用中文别名。（3分）
+SELECT vip_id,AVG(credits) 平均积分,COUNT(author_id) 作家数量 from author GROUP BY vip_id;
+-- 14. 查询小说数量大于等于2的分类编号和小说数量。（4分）
+SELECT t.type_id,COUNT(t.type_id) from story s LEFT JOIN type t ON s.type_id=t.type_id GROUP BY type_name HAVING COUNT(t.type_id)>=2;
+-- 15. 查询所有小说中浏览量最少的书的作品编号、作品名称和类型编号、浏览量。（4分）
+SELECT story_id, story_name,type_id,views_number FROM story WHERE views_number = (SELECT MIN(views_number) FROM story);
+-- 16. 查询积分比刘产高的作者所有信息。（5分）
+SELECT * FROM author WHERE credits > (SELECT credits FROM author WHERE author_name = '刘产');
+-- 17. 查询出哪些白银作家是没有写小说的，显示这些作家的姓名、等级名称。（8分）
+select author_name,vip_id from story a right join (select * from author where vip_id=(select vip_id from vip where vip_name='白银作家')) b on a.author_id=b.author_id where story_name is null;
+-- 18. 找出写过作品浏览量大于5000的作家的所有作品中浏览量不到1000的作品信息（8分）
+SELECT * from story WHERE author_id in
+(SELECT author_id  from  story  WHERE views_number >5000 ) and  views_number <1000;
+-- 19. 查询所有小说的小说编号、小说名称、浏览量、分类名称、作者姓名、作者积分、作者等级名称，结果字段要用中文别名，并按浏览量降序排列，如果浏览量一样的，再按积分降序排列。（10分)
+SELECT s.story_id'小说编号' ,s.story_name'小说名称',s.views_number'浏览量',t.type_name'分类名称',a.author_name'作者姓名', a.credits'作者积分',v.vip_name'作者等级名称' from story s LEFT JOIN author a  on s.author_id=a.author_id
+left join vip v on v.vip_id =a.vip_id
+LEFT JOIN type t on s.type_id= t.type_id
+ ORDER BY s.views_number desc , a.credits desc;
+```
+