sql题练习

1.  选择部门30中的所有员工.

select * from emp where deptno=30

2.  列出所有办事员(CLERK)的姓名，编号和部门编号.

select empno,ename,deptno from emp wherejob='CLERK'

3.  找出佣金高于薪金的员工. 

select * from emp where comm>sal

4.  找出佣金高于薪金的60%的员工.   

select * from emp where comm>sal*0.6

5.  找出部门10中所有经理(MANAGER)和部门20中所有办事员(CLERK)的详细资料.

select * from emp where (deptno=10 andjob='MANAGER') or (deptno=20 and job='CLERK')

6.  找出部门10中所有经理(MANAGER),部门20中所有办事员(CLERK),既不是经理又不是办事员但其薪金大于或等于2000的所有员工的详细资料.  

select * from emp where (deptno=10 and job='MANAGER') or(deptno=20 and job='CLERK')
or (sal>2000 and deptno!=10 and deptno!=20)