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+# 作业
+
+```mysql
+## 建库建表添加数据
+create database wugui charset utf8;
+use wugui;
+
+create table wuguiinfo (
+wuguino int primary key ,
+wuguiname varchar(20) not null,
+wuguisex char(5) not null,
+wuguiaddress varchar(20),
+wuguiprice varchar(100));
+
+create table wuguilevel (
+wuguino int primary key ,
+wuguirank varchar(10) not null,
+wuguiweight varchar(100));
+
+create table wuguitypee (
+wuguitype varchar(20) ,
+wuguino int not null primary key,
+foreign key(wuguino) REFERENCES wuguiinfo(wuguino));
+
+insert into wuguiinfo VALUES
+(1,'周富','母','下水道',1),
+(2,'赵敏大美女','公','皇宫',2500000),
+(3,'杨梅小公主','母','温州',2500000),
+(4,'乌龟大王谢铖浩','男','东海龟宫',1000000000),
+(5,'方增兴','公','数据库',250),
+(6,'林俊伟','公','花果山',251);
+
+insert into wuguilevel VALUES
+(1,'低级',250),
+(2,'至尊级',2500),
+(3,'高级',500),
+(4,'玄武级',60000),
+(5,'高级',666),
+(6,'高级',500);
+
+insert into wuguitypee values 
+('双面龟',1),
+('巴西龟',2),
+('蛋龟',3),
+('玄武',4),
+('巴西龟',5),
+('陆龟',6);
+```
+
+-- 1.查询出性别为母的乌龟
+
+```mysql
+select * from wuguiinfo where wuguisex='母';
+```
+
+--2.查询性别为公的乌龟
+
+```mysql
+select * from wuguiinfo where wuguisex='公';
+```
+
+-- 3.查询出每个乌龟的编号，姓名，性别,住址,价格
+
+```mysql
+select wuguino,wuguiname,wuguisex,wuguiaddress,wuguiprice from wuguiinfo;
+```
+
+-- 4.查询价格大于20000以上的乌龟信息
+
+```mysql
+select * from wuguiinfo where wuguiprice>20000;
+```
+
+-- 5.查询出价格低于200的乌龟信息
+
+```mysql
+select * from wuguiinfo where wuguiprice<200;
+```
+
+-- 6.查询不属于公母性别的乌龟
+
+```mysql
+select * from wuguiinfo where wuguisex not in ('公','母');
+```
+
+-- 7.查询每个乌龟对应的等级
+
+```mysql
+select wuguiinfo.wuguino,wuguiname,wuguirank from wuguiinfo left join wuguilevel on wuguiinfo.wuguino=wuguilevel.wuguino;
+```
+
+
+-- 8.查询出品种相同的乌龟
+
+```mysql
+```
+
+
+
+-- 9.查询字段wuguiName里面有大的名字
+
+```mysql
+select wuguiname from wuguiinfo where wuguiname like '%大%';
+```
+
+
+-- 10.按乌龟的价格进行降序
+
+```mysql
+select * from wuguiinfo order by wuguiprice desc;
+```
+
+
+
+-- 11将乌龟的品种进行去重
+
+```mysql
+SELECT
+	distinct wuguitype 
+FROM
+	wuguiinfo info
+	RIGHT JOIN wuguitypee typ ON info.wuguino = typ.wuguino 
+	where info.wuguino;
+```
+
+
+-- 12.将rank里面的体重求平均值
+
+```mysql
+select avg(wuguiweight) from wuguilevel;
+```
+
+
+-- 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
+
+```mysql
+select info.*,wuguiweight from wuguiinfo info left join wuguilevel lev on info.wuguino=lev.wuguino order by wuguiweight desc limit 0,3;
+```
+
+
+-- 14.在13的基础上获取里面乌龟价格最高的数据
+
+```mysql
+select max(wuguiprice) from (select info.*,wuguiweight from wuguiinfo info left join wuguilevel lev on info.wuguino=lev.wuguino order by wuguiweight desc limit 0,3) as temp ;
+```
+