字段:
员工id,员工名字,工作岗位,部门经理,受雇日期,薪水,奖金,部门编号
英文名:emp_no,ename,job,mgr,hire_date,sal,bonus,dept_no
字段:部门编号,部门名称,部门地点
英文名:dept_no,dept_name,dept_addr
create table IF NOT EXISTS emp(
emp_no int
,ename varchar(255)
,job varchar(255)
,mgr int
,hire_date DATE
,sal int
,bonus int
,dept_no int
);
create table IF NOT EXISTS dept(
dept_no int
,dept_name varchar(255)
,dept_addr varchar(255)
)
7369,SMITH,CLERK,7902,1980-12-17,800,null,20
7499,ALLEN,SALESMAN,7698,1981-02-20,1600,300,30
7521,WARD,SALESMAN,7698,1981-02-22,1250,500,30
7566,JONES,MANAGER,7839,1981-04-02,2975,null,20,
7654,MARTIN,SALESMAN,7698,1981-09-28,1250,1400,30
7698,BLAKE,MANAGER,7839,1981-05-01,2850,null,30
7782,CLARK,MANAGER,7839,1981-06-09,2450,null,10
7788,SCOTT,ANALYST,7566,1987-04-19,3000,null,20
7839,KING,PRESIDENT,null,1981-11-17,5000,null,10
7844,TURNER,SALESMAN,7698,1981-09-08,1500,0,30
7876,ADAMS,CLERK,7788,1987-05-23,1100,null,20
7900,JAMES,CLERK,7698,1981-12-03,950,null,30
7902,FORD,ANALYST,7566,1981-12-03,3000,null,20
7934,MILLER,CLERK,7782,1982-01-23,1300,null,10
10,ACCOUNTING,NEW YORK
10,ACCOUNTING,shanghai
20,RESEARCH,DALLAS
30,SALES,CHICAGO
40,OPERATIONS,BOSTON
薪水 = SAL
薪金 = 12SAL加奖金
年工资 = 年薪 = 12SAL
select e.dept_no
,count(*) as cnt
from emp e
group by e.dept_no
having cnt > 4;
select ename
,sal*12+e.bonus as total
from emp e
where (sal*12+e.bonus) > (select sal*12+e.bonus from emp e where e.ename='SMITH');
select e.ename as yg_name
,em.ename as sj_name
from emp e
left join emp em
on e.mgr=em.emp_no;
select *
from emp e
left join emp em
on e.mgr=em.emp_no
where e.hire_date < em.hire_date;
select *
from emp e,emp em
where e.mgr=em.emp_no and e.hire_date < em.hire_date;
select t1.dept_name
,t2.*
from
(select distinct d.dept_no
,d.dept_name
from dept d) t1
left join emp t2
on t1.dept_no=t2.dept_no;
select distinct emp.ename
,dept.dept_name
from emp
join dept
on emp.dept_no=dept.dept_no
where job='CLERK';
select distinct emp.ename
,dept.dept_name
from emp ,dept
where emp.dept_no=dept.dept_no
and job='CLERK';
select job
,min(sal) as min_sal
from emp
group by job
having min_sal>1500;
select *
from emp,dept
where emp.dept_no=dept.dept_no and dept.dept_name='SALES';
select ename
,sal*12+e.bonus as total
from emp e
where (sal*12+e.bonus) > (select avg(sal*12+bonus) from emp);
select * from emp where job =
(select job from emp where ename='SCOTT') and ename!='SCOTT';
select * from emp where sal in (
select sal from emp e where e.dept_no=30) and dept_no!=30;
select * from emp where (12*sal+bonus) > (
select max(12*sal + bonus) from emp e where e.dept_no=30) and dept_no!=30;
select e.dept_no
,count(*) as cnt
,avg(sal)
,avg(DATEDIFF(NOW(),e.hire_date))
from emp e
group by e.dept_no
select e.ename
,de.dept_name
,e.sal
from emp e
join dept de
on e.dept_no=de.dept_no;
select distinct t1.dept_no
,t1.dept_name
,t2.cnt
from dept t1
join (select dept_no,count(*) as cnt from emp group by dept_no) t2
on t1.dept_no=t2.dept_no;
select job,min(sal) from emp group by job
select dept_no
,min(sal*12+bonus) as min_total
from emp
where job='MANAGER'
group by dept_no;
select *,12*sal as total
from emp
order by total
select t2.*
from
(select dept_no
,max(sal) as max_sal
from emp
where sal not in (
select max(sal) max_sal
from emp
group by dept_no)
group by dept_no
union
select dept_no
,max(sal) max_sal
from emp
group by dept_no) as t1
join emp t2
on t1.dept_no = t2.dept_no and t1.max_sal=t2.sal
select * ,DATEDIFF('2018-12-12',hire_date)
from emp