diff --git "a/20 \345\206\257\351\224\220/20220315 \344\275\234\344\270\232.md" "b/20 \345\206\257\351\224\220/20220315 \344\275\234\344\270\232.md"
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+```mysql
+create database Ok;
+create database wugui charset utf8;
+use wugui;
+create table wugui_a(
+  wuguiNo int primary key auto_increment,
+  wuguiName varchar(50) not null ,
+  wuguiSex varchar(20) not null ,
+  wuguiAddress varchar(50) not null ,
+  wuguiprice varchar(255)
+);
+drop table wugui_b;
+create table wugui_b(
+  wuguiNo1 int primary key auto_increment,
+  wuguiRank varchar(20) not null ,
+  wuguiWeight int not null
+);
+drop table wugui_c;
+create table wugui_c(
+  wuguiType varchar(20),
+  wuguiNo int primary key auto_increment
+);
+insert into wugui_a values
+                        (null,'周富','母','下水道',1),
+                        (null,'赵敏大美女','公','皇宫',2500000),
+                        (null,'杨敏小公主','母','温州',2500000),
+                        (null,'乌龟大王谢铖浩','男','东海龟宫',1000000000),
+                        (null,'方增兴','公','数据库',250),
+                        (null,'林俊伟','公','花果山',251);
+insert into wugui_b values
+                        (null,'低级',250),
+                        (null,'至尊级',2500),
+                        (null,'高级',500),
+                        (null,'玄武级',60000),
+                        (null,'高级',666),
+                        (null,'高级',500);
+insert into wugui_c values
+                        ('双面龟',null),
+                        ('巴西龟',null),
+                        ('蛋龟',null),
+                        ('玄武',null),
+                        ('巴西龟',null),
+                        ('陆龟',null);
+-- 1.查询出性别为母的乌龟
+select * from wugui_a where wuguiSex='母';
+-- 2.查询性别为公的乌龟
+select * from wugui_a where wuguiSex='公';
+-- 3.查询出每个乌龟的编号，姓名，性别,住址,价格
+select * from wugui_a;
+-- 4.查询价格大于20000以上的乌龟信息
+select * from wugui_a where wuguiprice>20000;
+-- 5.查询出价格低于200的乌龟信息
+select * from wugui_a where wuguiprice<200;
+-- 6.查询不属于公母性别的乌龟
+select * from wugui_a where wuguiSex !='公' and wuguiSex !='母';
+-- 7.查询每个乌龟对应的等级
+select wuguiRank,wuguiType from wugui_b b,wugui_c c where b.wuguiNo1=c.wuguiNo;
+-- 8.查询出品种相同的乌龟
+select wuguiType from wugui_c group by wuguiType having count(wuguiType);
+select wuguiType from wugui_c where wuguiType in (select wuguiType from wugui_c group by wuguiType having count(wuguiType) > 1);
+-- 9.查询字段wuguiName里面有大的名字
+select wuguiName from wugui_a where wuguiName like '%大%';
+-- 10.按乌龟的价格进行降序
+select * from wugui_a order by wuguiprice desc ;
+-- 11将乌龟的品种进行去重
+select wuguiType from wugui_c where 
+-- 12.将rank里面的体重求平均值
+select avg(wuguiWeight) 平均值 from wugui_b group by wuguiRank;
+-- 13.将info和rank表连接，然后按照rank的体重进行降序，在获取表内的前3行记录
+select * from wugui_a a,wugui_b b where a.wuguiNo=b.wuguiNo1 order by wuguiWeight desc limit 3 ;
+-- 14.在13的基础上获取里面乌龟价格最高的数据
+select max(wuguiprice) from wugui_a a,wugui_b b where a.wuguiNo=b.wuguiNo1 order by wuguiWeight desc limit 3 ;
+```
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