From c3e6b6e7f77d543019b7ab0411fc17ec84090a2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=88=E4=BD=B3=E7=82=9C?= <626104790@qq.com>
Date: Fri, 17 Mar 2023 12:05:08 +0800
Subject: [PATCH] =?UTF-8?q?mysql=E7=AC=AC=E4=B8=83=E6=AC=A1=E4=BD=9C?=
 =?UTF-8?q?=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...03\346\254\241\344\275\234\344\270\232.md" | 135 ++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 "26 \351\231\210\344\275\263\347\202\234/23317\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.md"

diff --git "a/26 \351\231\210\344\275\263\347\202\234/23317\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.md" "b/26 \351\231\210\344\275\263\347\202\234/23317\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..5359608
--- /dev/null
+++ "b/26 \351\231\210\344\275\263\347\202\234/23317\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.md"	
@@ -0,0 +1,135 @@
+CREATE DATABASE nb charset utf8;
+
+use nb;
+
+CREATE table `user`(
+
+user_id int,
+
+user_name varchar(20),
+
+user_tel VARCHAR(20),
+
+ordertime date
+
+);
+
+CREATE table `order`(
+
+order_id int,
+
+user_id int,
+
+type VARCHAR(20),
+
+food VARCHAR(20),
+
+number int,
+
+price int
+
+);
+
+INSERT into `user` VALUES
+
+(1,'张三',19865645691,'2023-3-13'),
+
+(2,'李四',12345675691,'2023-3-13'),
+
+(3,'王五',12895678901,'2023-3-13'),
+
+(4,'老六',12345678691,'2023-3-14'),
+
+(5,'小七',18945678031,NULL),
+
+(6,'老八',19345678561,'2023-3-16'),
+
+(7,'朱九',15845679911,NULL);
+
+INSERT into `order` VALUES 
+
+(1,1,'快餐','肯德基全家桶',1,50),
+
+(2,1,'快餐','可乐',4,20),
+
+(3,6,'饮料','柠檬水',2,16),
+
+(4,2,'米饭','鱼香肉丝盖饭',5,60),
+
+(5,2,'饮料','珍珠奶茶',3,22),
+
+(6,3,'粉面团','螺蛳粉',4,28),
+
+(7,4,'粉面团','凉拌面',1,10);
+
+
+
+-- 1.在用户表（user）新增一个性别字段user_sex，数据类型为char。
+
+alter table user add user_sex char;
+
+
+
+-- 2.由于顾客3退单，请把此订单删除。
+
+delete FROM `order` where `order_id` = 6;
+
+
+
+-- 3.老八的电话号码换新了，请将他的号码更新为8888888888。
+
+UPDATE user set user_tel = 8888888888 where user_id = 6;
+
+SELECT * from user;
+
+-- 4.查询order表里的最高金额和总金额。
+
+SELECT max(price),(SELECT max(price*number) from `order`) from `order`;
+
+
+
+-- 5.查询每个顾客分别订购了几个类别。
+
+SELECT user_id,type,number from `order` GROUP BY user_id,type;
+
+
+
+-- 6.查询饮料的总金额
+
+SELECT sum(number * price) from `order` where type = '饮料';
+
+-- 7.查询订单表（order）里的订单号，类别（type），食物（food）.
+
+SELECT order_id,type,food from `order`;
+
+
+
+-- 8.查询没吃饭的人的所有信息
+
+SELECT * from user a left join `order` b ON
+
+a.user_id=b.user_id
+
+where a.user_id in (SELECT DISTINCT user_id from `order`)
+
+GROUP BY a.user_id;
+
+
+
+-- 9.查询姓老的人的全部信息及订单信息
+
+SELECT * from user a left join `order` b on
+
+a.user_id=b.user_id
+
+WHERE a.user_name like '老%';
+
+
+
+-- 10.查询总金额大于20的订单里最大值的用户信息，使用降序排列。
+
+SELECT * FROM user a left join `order` b on
+
+a.user_id=b.user_id
+
+WHERE price * number in (select max(price * number) from `order`) and price > 20;
\ No newline at end of file
-- 
Gitee