SQL窗口函数OVER用法实例整理

create table Employee
(
    ID INT PRIMARY KEY
    ,Name VARCHAR(20)
    ,GroupName VARCHAR(20)
    ,Salary INT
) INSERT into Employee VALUES(1, '小明', '开发部', 8000), (4, '小张', '开发部', 7600), (5, '小白', '开发部', 7000), (8, '小王', '财务部', 5000), (9, null, '财务部', NULL), (15, '小刘', '财务部', 6000), (16, '小高', '行政部', 4500), (18, '小王', '行政部', 4000), (23, '小李', '行政部', 4500), (29, '小吴', '行政部', 4700)
;

select  *
        ,SUM(Salary) OVER(PARTITION BY Groupname) 每个组的总工资
        ,SUM(Salary) OVER(PARTITION BY groupname ORDER BY ID) 每个组的累计总工资
        ,SUM(Salary) OVER(ORDER BY ID) 累计工资
        ,SUM(Salary) OVER() 总工资
from    Employee

SUM(Salary) OVER (PARTITION BY Groupname)

SUM(Salary) OVER (PARTITION BY Groupname ORDER BY ID)

SUM(Salary) OVER (ORDER BY ID)

SUM(Salary) OVER ()

select  *
        ,ROW_NUMBER() OVER (PARTITION BY ClassName ORDER BY SCORE DESC) 班内排序
        ,ROW_NUMBER() OVER (ORDER BY SCORE DESC) AS 总排序
from    Scores
;

select  ROW_NUMBER() OVER (ORDER BY SCORE DESC) AS [RANK]
        ,*
from    Scores
;

select  RANK() OVER (ORDER BY SCORE DESC) AS [RANK]
        ,*
from    Scores
;

select  *
        ,NTILE(1) OVER (ORDER BY SCORE DESC) AS 分区后排序
from    Scores
;
select  *
        ,NTILE(2) OVER (ORDER BY SCORE DESC) AS 分区后排序
from    Scores
;
select  *
        ,NTILE(3) OVER (ORDER BY SCORE DESC) AS 分区后排序
from    Scores
;

select  *
        ,SUM(Salary) OVER(PARTITION BY groupname ORDER BY ID ROWS between CURRENT ROW and 5 FOLLOWING) 从当前行开始后5行的和
from    Employee