-sql语法-2-部门表

部门表

dept部门表(deptno部门编号/dname部门名称/loc地点)
create table dept (deptno numeric(2),dname varchar(14),loc varchar(13)
);insert into dept values (10, 'ACCOUNTING', 'NEW YORK');
insert into dept values (20, 'RESEARCH', 'DALLAS');
insert into dept values (30, 'SALES', 'CHICAGO');
insert into dept values (40, 'OPERATIONS', 'BOSTON');

工资等级表

salgrade工资等级表(grade 等级/losal此等级的最低/hisal此等级的最高)
create table salgrade (grade numeric,losal numeric,hisal numeric
);insert into salgrade values (1, 700, 1200);
insert into salgrade values (2, 1201, 1400);
insert into salgrade values (3, 1401, 2000);
insert into salgrade values (4, 2001, 3000);
insert into salgrade values (5, 3001, 9999);

员工表

emp员工表(empno员工号/ename员工姓名/job工作/mgr上级编号/hiredate受雇日期/sal薪金/comm佣金/deptno部门编号) 工资 ＝ 薪金 ＋ 佣金
1.表自己跟自己连接

create table emp (empno numeric(4) not null,ename varchar(10),job varchar(9),mgr numeric(4),hiredate datetime,sal numeric(7, 2),comm numeric(7, 2),deptno numeric(2)
);insert into emp values (7369, 'SMITH', 'CLERK', 7902, '1980-12-17', 800, null, 20);
insert into emp values (7499, 'ALLEN', 'SALESMAN', 7698, '1981-02-20', 1600, 300, 30);
insert into emp values (7521, 'WARD', 'SALESMAN', 7698, '1981-02-22', 1250, 500, 30);
insert into emp values (7566, 'JONES', 'MANAGER', 7839, '1981-04-02', 2975, null, 20);
insert into emp values (7654, 'MARTIN', 'SALESMAN', 7698, '1981-09-28', 1250, 1400, 30);
insert into emp values (7698, 'BLAKE', 'MANAGER', 7839, '1981-05-01', 2850, null, 30);
insert into emp values (7782, 'CLARK', 'MANAGER', 7839, '1981-06-09', 2450, null, 10);
insert into emp values (7788, 'SCOTT', 'ANALYST', 7566, '1982-12-09', 3000, null, 20);
insert into emp values (7839, 'KING', 'PRESIDENT', null, '1981-11-17', 5000, null, 10);
insert into emp values (7844, 'TURNER', 'SALESMAN', 7698, '1981-09-08', 1500, 0, 30);
insert into emp values (7876, 'ADAMS', 'CLERK', 7788, '1983-01-12', 1100, null, 20);
insert into emp values (7900, 'JAMES', 'CLERK', 7698, '1981-12-03', 950, null, 30);
insert into emp values (7902, 'FORD', 'ANALYST', 7566, '1981-12-03', 3000, null, 20);
insert into emp values (7934, 'MILLER', 'CLERK', 7782, '1982-01-23', 1300, null, 10);

selsect

1查询出部门编号为30的所有员工的编号和姓名

select 
deptno,empno,ename 
from emp
where deptno=30
group by deptno,empno,ename

2.找出部门编号为10中所有经理，和部门编号为20中所有销售员的详细资料

select * from emp
where 
deptno=10 and job='manager'
union all
select * from emp
where 
deptno=20 and job='salesman'

3.查询所有员工详细信息，用工资降序排序，如果工资相同使用入职日期升序排序

select 
empno,ename,job,mgr,hiredate,sal,comm,deptno,
(sal+ifnull(comm,0)) as sal 
from emp
order by sal desc,hiredate asc;

4.列出最低薪金大于1500的各种工作及从事此工作的员工人数。

select
job,
sum(sal)as sal,
count(ename)as pcount
from emp 
group by job
having sum(sal)>1500

5.列出在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 job,deptno
from emp
where job='salesman'

6.查询姓名以S开头的\以S结尾\包含S字符\第二个字母为L

select ename from emp
where ename like 's%'; 

select ename from emp
where ename like '%s'; 

select ename from emp
where ename like '%s%'; 

select ename from emp
where ename like '_l%';

7.查询每种工作的最高工资、最低工资、人数

select
job,
max(sal+ifnull(comm,0)),
min(sal+ifnull(comm,0)),
count(empno)
from emp
group by job;

8.列出薪金 高于 公司平均薪金的所有员工号，员工姓名，所在部门名称，上级领导，工资，工资等级

select 
e.empno,e.ename,d.dname,e.mgr,e.sal,s.grade
from emp as e
left join dept as d on e.deptno=d.deptno
left join salgrade as s on e.sal>s.losal and e.sal(select avg(sal) from emp)

9.列出薪金 高于 在部门30工作的 所有/任何一个员工的薪金的员工姓名和薪金、部门名称。

select 
e.ename,e.sal,d.dname
from emp as e
left join dept as d on e.deptno=d.deptno
where e.sal>(select max(sal) from emp where deptno=30)select 
e.ename,e.sal,d.dname
from emp as e
left join dept as d on e.deptno=d.deptno
where e.sal>(select min(sal) from emp where deptno=30)

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