From 418f664d0994af7f6bb3cc860090b0e98f9cd1c7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=86=AF=E5=BB=BA=E7=A8=8B?= <1063126776@qq.com>
Date: Sat, 18 Mar 2023 13:26:02 +0800
Subject: [PATCH] mysql

---
 .../20230315 \344\275\234\344\270\232.md"     | 99 +++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 "07 \345\206\257\345\273\272\347\250\213/20230315 \344\275\234\344\270\232.md"

diff --git "a/07 \345\206\257\345\273\272\347\250\213/20230315 \344\275\234\344\270\232.md" "b/07 \345\206\257\345\273\272\347\250\213/20230315 \344\275\234\344\270\232.md"
new file mode 100644
index 0000000..7ff6661
--- /dev/null
+++ "b/07 \345\206\257\345\273\272\347\250\213/20230315 \344\275\234\344\270\232.md"	
@@ -0,0 +1,99 @@
+CREATE DATABASE text charset utf8;
+use text;
+
+CREATE table info(
+wuguiNo int  PRIMARY KEY auto_increment,
+wuguiName VARCHAR(20),
+wuguiSex VARCHAR(20),
+wuguiAddress VARCHAR(20),
+wuguiPrice int
+);
+
+INSERT INTO info VALUES
+(null,'周富','母','下水道',1),
+(null,'赵敏大美女','公','皇宫',2500000),
+(null,'杨梅小公主','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);
+
+CREATE table rank(
+wuguiNo1 int ,
+wuguiRank VARCHAR(20),
+wuguiWeight INT,
+FOREIGN KEY(wuguiNo1) REFERENCES info(wuguiNo)
+);
+
+
+INSERT into rank 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);
+
+
+CREATE table t (
+wuguiType VARCHAR(20),
+wuguiNo INT, 
+FOREIGN KEY (wuguiNo) REFERENCES rank(wuguiNo1)
+);
+
+INSERT into t 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
+
+SELECT * from info WHERE wuguiSex = '母';
+
+-- --2.查询性别为公的乌龟SELECT * from info WHERE wuguiSex = '公';
+
+-- 3.查询出每个乌龟的编号，姓名，性别,住址,价格
+
+SELECT * from info;
+
+-- 4.查询价格大于20000以上的乌龟信息
+
+SELECT * FROM info WHERE wuguiPrice >20000;
+-- 5.查询出价格低于200的乌龟信息
+
+SELECT * FROM info WHERE wuguiPrice <200;
+
+-- 6.查询不属于公母性别的乌龟
+
+SELECT * FROM info  WHERE wuguiSex !='公' and wuguiSex !='母';
+-- 7.查询每个乌龟对应的等级
+
+SELECT info.*,rank.wuguiRank FROM info JOIN rank ON info.wuguiNo = rank.wuguiNo1 ; 
+
+-- 8.查询出品种相同的乌龟
+
+SELECT * FROM t a JOIN t b on a.wuguiNo=b.wuguiNo WHERE a.wuguiType=b.wuguiType and a.wuguiNo != b.wuguiNo;
+(SELECT * FROM t JOIN info on w.wuguiNo=t.wuguiNo)as a   ;
+
+-- 9.查询字段wuguiName里面有大的名字
+
+SELECT * FROM info WHERE wuguiName LIKE '%大%';
+-- 10.按乌龟的价格进行降序
+
+SELECT * FROM info ORDER BY wuguiPrice DESC;
+-- 11将乌龟的品种进行去重
+
+  SELECT DISTINCT wuguiType FROM t ;
+-- 12.将rank里面的体重求平均值
+
+SELECT AVG(wuguiWeight) FROM rank ; 
+
+-- 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 info i JOIN rank r on i.wuguiNo=r.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 *  FROM info i JOIN rank r on i.wuguiNo=r.wuguino1  WHERE wuguiPrice in (SELECT max(wuguiPrice) FROM info) ORDER BY wuguiWeight DESC LIMIT 3   ;
\ No newline at end of file
-- 
Gitee