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+```sql
+![](https://s2.loli.net/2023/10/20/ygDHKSmPY9fd3CU.jpg)
+
+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);
+
+# 1、列出最低薪金大于1500的各种工作。
+select * 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 *from emp where deptno=(select deptno from dept where dname='销售部');
+# 3、列出薪金高于公司平均薪金的所有员工。
+with a as(
+select empno,(sal+ifnull(comm,0)) x,avg(sal+ifnull(comm,0)) over () s from emp)
+select * from a,emp where x>s and a.empno=emp.empno;
+# 4、列出与"周八"从事相同工作的所有员工。
+select * 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。
+with a as(
+select *,(sal+ifnull(comm,0)) x from emp ),
+b as
+(select empno,(sal+ifnull(comm,0)) z from emp where deptno=30)
+select a.* from a,b where a.empno=b.empno and x=z;
+;
+# 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。
+with a as(
+select *,(sal+ifnull(comm,0)) x from emp ),
+b as
+(select max((sal+ifnull(comm,0))) z from emp where deptno=30)
+select a.* from a,b where x>z;
+# 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。
+with a as
+(select deptno,avg(sal) 平均工资 ,avg(year(now())-year(hiredate)) 平均服务年限 from emp group by deptno),
+b as
+(select distinct deptno,count(*) over (partition by deptno) 员工数量 from emp)
+select a.deptno,员工数量,平均工资,平均服务年限 from a,b where a.deptno=b.deptno;
+;
+# 8、列出所有员工的姓名、部门名称和工资。
+select ename 姓名,dname 部门名称,sal 工资 from emp,dept WHERE emp.deptno=dept.deptno;
+# 9、列出所有部门的详细信息和部门人数。
+WITH a as (
+SELECT * from dept),
+b as
+(SELECT deptno,count(*) ovre (partition by deptno) s from emp)
+SELECT a.*,b.s from a,b WHERE a.deptno=b.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 d.dname,e.ename,e.job, MIN(sal)over(PARTITION by d.dname) from emp e,dept d where e.deptno=d.deptno  and e.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*12) 年工资 from emp ORDER BY 年工资
+
+```
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