create database test_emp;
use test_emp;
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:EMPNO,ENAME,JOB,MGR,HIREDATE,SAL,BONUS,DEPTNO
create table emp(
EMPNO int
,ENAME string
,JOB string
,MGR int
,HIREDATE string
,SAL int
,BONUS int
,DEPTNO int
)
row format delimited
fields terminated by ',';
在/usr/local/soft/data目录下创建testemp.txt文件将下方数据复制进去。
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
load data local inpath '/usr/local/soft/data/testemp.txt' into table emp;
字段:部门编号,部门名称,部门地点
英文名:DEPTNO,DEPTNAME,DEPTADDR
create table dept(
DEPTNO int
,DEPTNAME string
,DEPTADDR string
)
row format delimited
fields terminated by ',';
在/usr/local/soft/data目录下创建testdept.txt文件将下方数据复制进去。
10,ACCOUNTING,NEW YORK
10,ACCOUNTING,shanghai
20,RESEARCH,DALLAS
30,SALES,CHICAGO
40,OPERATIONS,BOSTON
load data local inpath '/usr/local/soft/data/testdept.txt' into table dept;
select t1.deptno
,t1.DEPTNAME
,t1.DEPTADDR
,t2.cnt
from dept t1
join (
select deptno
,count(distinct EMPNO) as cnt
from emp
group by deptno
)t2
on t1.deptno = t2.deptno;
select t1.EMPNO
,t1.ENAME
,t1.sal_bonus
from (
select EMPNO
,ENAME
,12*SAL+nvl(BONUS,0) as sal_bonus
,1 as tmp_id
from emp
) t1
join (
select 12*SAL+nvl(BONUS,0) as sal_bonus
,1 as tmp_id
from emp
where ENAME = 'SMITH'
) t2 on t1.tmp_id = t2.tmp_id
where t1.sal_bonus > t2.sal_bonus;
select t1.EMPNO
,t2.ENAME as leader_name
from emp t1 join emp t2
on t1.MGR = t2.EMPNO;
select distinct
t1.DEPTNO
,t1.DEPTNAME
,t2.EMPNO
,t2.ENAME
from dept t1
left join emp t2
on t1.DEPTNO = t2.DEPTNO;
select distinct
t1.DEPTNO
,t1.DEPTNAME
,t2.EMPNO
,t2.ENAME
from dept t1
left join emp t2
on t1.DEPTNO = t2.DEPTNO;
select t1.ENAME
,t2.DEPTNAME
from (
select ENAME
,DEPTNO
from emp
where JOB = 'CLERK'
) t1
join (
select distinct
DEPTNO
,DEPTNAME
from dept
) t2
on t1.DEPTNO = t2.DEPTNO;
select t1.JOB
,t1.min_sal
from (
select JOB
,min(SAL) as min_sal
from emp
group by JOB
) t1
where t1.min_sal > 1500;
select EMPNO
,ENAME
from emp
where DEPTNO in (
select DEPTNO
from dept
where DEPTNAME = 'SALES'
);
select t1.EMPNO
,t1.ENAME
,t1.sal_bonus
from (
select EMPNO
,ENAME
,12*SAL+nvl(BONUS,0) as sal_bonus
,1 as tmp_id
from emp
) t1 join (
select round(avg(12*SAL+nvl(BONUS,0)),2) as avg_sal_bonus
,1 as tmp_id
from emp
) t2
on t1.tmp_id = t2.tmp_id
where t1.sal_bonus > t2.avg_sal_bonus;
select EMPNO
,t1.ENAME
,JOB
from emp t1
where t1.ENAME != 'SCOTT'
and exists (
select JOB
from emp t2
where ENAME = 'SCOTT' and t1.JOB=t2.JOB
);
select EMPNO
,t1.ENAME
,JOB
from emp t1
where t1.ENAME != 'SCOTT'
and JOB in (
select JOB
from emp
where ENAME = 'SCOTT'
);
select t1.ENAME
,t1.SAL
from emp t1
where t1.DEPTNO !=30
and t1.SAL in (
select SAL
from emp
where DEPTNO = 30
);
没有相关的信息
select t1.ENAME
,t1.sal_bonus
,t2.max_sal_bonus
from (
select t1.ENAME
,12*t1.SAL+nvl(t1.BONUS,0) as sal_bonus
from emp t1
where t1.EMPNO !=30
) t1
join (
select max(12*SAL+nvl(BONUS,0)) as max_sal_bonus
from emp
where DEPTNO = 30
) t2
on 1=1
where t1.sal_bonus > t2.max_sal_bonus;
select DEPTNO
,count(distinct EMPNO) as cnt
,round(avg(12*SAL+nvl(BONUS,0)),2) as avg_sal_bonus
,round(avg(datediff(current_date(),HIREDATE)),2) as avg_work_days
from emp
group by DEPTNO;
select t1.ENAME
,t1.SAL
,t2.DEPTNAME
,t2.DEPTADDR
from emp t1
join dept t2
on t1.DEPTNO = t2.DEPTNO;
select t2.DEPTNO
,t2.DEPTNAME
,t2.DEPTADDR
,t1.cnt
from (
select DEPTNO
,count(distinct EMPNO) as cnt
from emp
group by DEPTNO
)t1 right join dept t2
on t1.DEPTNO = t2.DEPTNO;
select JOB
,min(SAL) as min_sal
from emp
group by JOB;
select t1.DEPTNO
,min(12*SAL+nvl(BONUS,0)) as min_sal_bonus
from (
select DEPTNO
,SAL
,BONUS
from emp
where JOB = 'MANAGER'
)t1
group by t1.DEPTNO;
select EMPNO
,ENAME
,12*SAL+nvl(BONUS,0) as year_sal
from emp
order by year_sal;
select t1.DEPTNO
,t1.ENAME
,t1.SAL
,t1.rn
from (
select DEPTNO
,ENAME
,SAL
,row_number() over (partition by DEPTNO ORDER by SAL DESC) as rn
from emp
) t1
where t1.rn <= 2;
select EMPNO
,ENAME
,datediff('2018-12-12',HiREDATE) as days
from emp;
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