From 1ff855fede56886634eba821e240aa211268f832 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=9D=A8=E6=A2=853?=
 <12071605+yangmei3@user.noreply.gitee.com>
Date: Thu, 19 Oct 2023 16:53:22 +0000
Subject: [PATCH] 20231020
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 杨梅3 <>
---
 .../\345\244\215\344\271\240.md"              | 119 ++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 "27 \346\235\250\346\242\205/\345\244\215\344\271\240.md"

diff --git "a/27 \346\235\250\346\242\205/\345\244\215\344\271\240.md" "b/27 \346\235\250\346\242\205/\345\244\215\344\271\240.md"
new file mode 100644
index 0000000..6adc74b
--- /dev/null
+++ "b/27 \346\235\250\346\242\205/\345\244\215\344\271\240.md"	
@@ -0,0 +1,119 @@
+```mysql
+-- Sql12练习
+-- 建表语句：
+
+-- 执行以下SQL，建表插数：
+
+create database Apple charset utf8;
+use Apple;
+-- 部门表
+create table dept(
+	deptno int primary key auto_increment, -- 部门编号
+	dname varchar(14) ,	  -- 部门名字
+	loc varchar(13)   -- 地址
+) ;
+-- 员工表
+create table emp(
+	empno int primary key auto_increment,-- 员工编号
+	ename varchar(10), -- 员工姓名										-
+	job varchar(9),	-- 岗位
+	mgr int,	 -- 直接领导编号
+	hiredate date, -- 雇佣日期，入职日期
+	sal int, -- 薪水
+	comm int,  -- 提成
+	deptno int not null, -- 部门编号
+	foreign key (deptno) references dept(deptno)
+);
+insert into dept values(10,'财务部','北京');
+insert into dept values(20,'研发部','上海');
+insert into dept values(30,'销售部','广州');
+insert into dept values(40,'行政部','深圳');
+insert into emp values(7369,'刘一','职员',7902,'1980-12-17',800,null,20);
+insert into emp values(7499,'陈二','推销员',7698,'1981-02-20',1600,300,30);
+insert into emp values(7521,'张三','推销员',7698,'1981-02-22',1250,500,30);
+insert into emp values(7566,'李四','经理',7839,'1981-04-02',2975,null,20);
+insert into emp values(7654,'王五','推销员',7698,'1981-09-28',1250,1400,30);
+insert into emp values(7698,'赵六','经理',7839,'1981-05-01',2850,null,30);
+insert into emp values(7782,'孙七','经理',7839,'1981-06-09',2450,null,10);
+insert into emp values(7788,'周八','分析师',7566,'1987-06-13',3000,null,20);
+insert into emp values(7839,'吴九','总裁',null,'1981-11-17',5000,null,10);
+insert into emp values(7844,'郑十','推销员',7698,'1981-09-08',1500,0,30);
+insert into emp values(7876,'郭十一','职员',7788,'1987-06-13',1100,null,20);
+insert into emp values(7900,'钱多多','职员',7698,'1981-12-03',950,null,30);
+insert into emp values(7902,'大锦鲤','分析师',7566,'1981-12-03',3000,null,20);
+insert into emp values(7934,'木有钱','职员',7782,'1983-01-23',1300,null,10);
+-- 完成以下练习题
+
+-- 1、列出最低薪金大于1500的各种工作。sal
+select job,sal from emp where sal >1500;
+-- 2、列出在部门 "销售部" 工作的员工的姓名，假定不知道销售部的部门编号。
+select deptno from dept where dname='销售部';
+select * from emp e left join dept d on e.deptno=d.deptno;
+
+SELECT
+	* 
+FROM
+	emp e
+	LEFT JOIN dept d ON e.deptno = d.deptno 
+WHERE
+	dname = '销售部';
+-- 3、列出薪金高于公司平均薪金的所有员工。
+select * from emp;
+select sal+ifnull(comm,0),ename from emp where sal > (select avg(sal+ifnull(comm,0)) from emp);
+
+-- 4、列出与"周八"从事相同工作的所有员工。
+select job from emp where ename='周八';
+select ename,job from emp where job=(select job from emp where ename='周八');
+
+-- 5、列出薪金等于部门30中员工的薪金的所有员工的姓名和薪金。
+select sal+ifnull(comm,0),ename,deptno from emp where deptno=30;
+
+-- 6、列出薪金高于在部门30工作的所有员工的薪金的员工姓名和薪金。
+SELECT
+	ename,
+	sal 
+FROM
+	emp 
+WHERE
+	sal + ifnull( comm, 0 ) > 
+	( SELECT max( sal + ifnull( comm, 0 )) FROM emp WHERE deptno = 30 );
+-- 7、列出在每个部门工作的员工数量、平均工资、平均服务年限门
+SELECT DISTINCT
+	deptno,
+	count( ename ) over ( PARTITION BY deptno ),
+	floor(
+	avg( sal ) over ( PARTITION BY deptno )),
+	floor( avg( datediff( now(), hiredate )/ 365 ) over ( PARTITION BY deptno ) ) 
+FROM
+	emp;
+-- 8、列出所有员工的姓名、部名称和工资。
+select ename,deptno,sal from emp;
+-- 9、列出所有部门的详细信息和部门人数。
+SELECT DISTINCT
+	count( ename ) over ( PARTITION BY deptno ),
+	e.deptno,
+	dname,
+	loc 
+FROM
+	dept d
+	LEFT JOIN emp e ON d.deptno = e.deptno;
+
+-- 10、列出各种工作的最低工资。
+select distinct job, min(sal) over(partition by job ) from emp;
+
+-- 11、列出各个部门的 经理 的最低薪金。
+SELECT DISTINCT
+	deptno,
+	min(
+	sal + ifnull( comm, 0 )) over ( PARTITION BY deptno ) 
+FROM
+	emp 
+WHERE
+	job = '经理';
+-- 12、列出所有员工的年工资,按年薪从低到高排序。 
+select (sal+ifnull(comm,0)*12) A from emp order by A;
+
+
+
+```
+
-- 
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