Oracle学习--分析函数over

oracle的分析函数over

create table TEST001

(

  EMPNO NUMBER(4),

  ENAME VARCHAR2(50),

  SAL   NUMBER(8,4)

)

INSERT INTO TEST001 values(3,'James',1000);

INSERT INTO TEST001 values(3,'Allen',800);

INSERT INTO TEST001 values(2,'Blake',600);

INSERT INTO TEST001 values(2,'Ward',300);

INSERT INTO TEST001 values(1,'Turner',1200);

1.各部门总额

select empno,sum(sal) as 部门总金额 from test001 group by empno;

2.各部门总额所占比例

select empno, empno_total,total,round(empno_total/total*100,2)||'%' as pst 

from( select  empno, empno_total, sum(empno_total) over() as total 

       from (select empno,sum(sal) empno_total from test001 group by empno))

 3.个人占总额比

select empno,ename,sal,round(sal/total,2) pst from       

     (select empno,ename,sal,sum(sal) over() as total from test001 order by 1)

 4.依次累加sum() over(order by)

select empno,ename,sal,sum(sal) over(order by empno) as total from test001 order by 1

 5.分区累加sum() over(partition by)

select empno,ename,sal,sum(sal) over(partition by empno ) as total from test001 order by 1

 与select empno,sum(sal) from test001 group by empno类似，但不能获取分组字段外值

6.区内累加sum(xx) over(partition by xx order by xx)

select empno,ename,sal,sum(sal) over(partition by empno order by ename ) as total from test001 order by 1