文档介绍：建表:
dept:
deptno(primary key),dname,loc
emp:
empno(primary key),ename,job,mgr,sal,deptno
1 列出emp表中各部门的部门号,最高工资,最低工资
select max(sal) as 最高工资,min(sal) as 最低工资,deptno from emp group by deptno;
2 列出emp表中各部门job为'CLERK'的员工的最低工资,最高工资
select max(sal) as 最高工资,min(sal) as 最低工资,deptno as 部门号 from emp where job = 'CLERK' group by deptno;
3 对于emp中最低工资小于1000的部门,列出job为'CLERK'的员工的部门号,最低工资,最高工资
select max(sal) as 最高工资,min(sal) as 最低工资,deptno as 部门号 from emp as b
where job='CLERK' and 1000>(select min(sal) from emp as a where =) group by
4 根据部门号由高而低,工资有低而高列出每个员工的姓名,部门号,工资
select deptno as 部门号,ename as 姓名,sal as 工资 from emp order by deptno desc,sal asc
5 写出对上题的另一解决方法
(请补充)
6 列出'张三'所在部门中每个员工的姓名与部门号
select ename,deptno from emp where deptno = (select deptno from emp where ename = '张三')
7 列出每个员工的姓名,工作,部门号,部门名
select ename,job,, from emp,dept where =
8 列出emp中工作为'CLERK'的员工的姓名,工作,部门号,部门名
select ename,job,,dname from emp,dept where = and job='CLERK'
9 对于emp中有管理者的员工,列出姓名,管理者姓名(管理者外键为mgr)
select as 姓名, as 管理者 from emp as a,emp as b where is not null and
=
10 对于dept表中,列出所有部门名,部门号,同时列出各部门工作为'CLERK'的员工名与工作
select dname as 部门名, as 部门号,ename as 员工名,job as 工作 from dept,emp
where *= and job = 'CLERK'
11 对于工资高于本部门平均水平的员工,列