mysql练习02

create table emp (

empno int(10) primary key,

ename varchar(20),

deptno int(10),

sal decimal(10,2)

);

create table department (

deptno int(10) primary key,

dname varchar(20),

manager varchar(20)

);

根据题目的关键字自行构建测试数据（比较重要）

  （1）向职工表中插入行（‘025’，‘王芳’，‘03’，1000）

insert into emp values(‘025‘, ‘王芳‘, ‘03‘, ‘1000‘);

  （2）从职工表中删除人事处的所有员工

delete from emp where deptno = (select deptno from department where dname = ‘人事处‘);

  （3）将职工号为‘001’的员工工资改为700元钱

update emp set sal = ‘700‘ where empno = ‘001‘;

  （4）查询人事处的员工最高工资

select max(sal) from emp where deptno = (select deptno from department where dname = ‘人事处‘);

  （5）查询“王芳”所在部门的部门主任

select manager from department where deptno = (select deptno from emp where ename = ‘王芳‘);

（6）查询与“王芳”在同一部门的其它员工信息

select * from emp where deptno = (select deptno from emp where ename = ‘王芳‘) and ename not like ‘王芳‘;

  （7）建立公司所有部门的公共视图——部门职工视图

create view dept_sta_view(empno, ename, deptno, sal, dname, mgr) as select a.empno, a.ename, a.deptno, a.sal, b.dname, b.manager from emp a, department b where a.deptno = b.deptno;

  （8）从部门职工视图中查询财务处员工工资高于800元的员工信息

select * from dept_sta_view where sal > ‘800‘ and dname = ‘财务处‘;

mysql练习02

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