Question

可能重复：
Function to Calculate Median in Sql Server

目标：
根据以下代码显示中值的值。

问题：
我不知道如何在SQL server中显示它

该表可以在将来检索新值，并且所有行都可以是奇数或偶数。

declare @T table 
( 
  Name varchar(50), 
  Sales int 
) 

insert into @T values 
('John',     '50'), 
('Jennifer', '15'), 
('Stella',   '20'), 
('Sophia',   '40'), 
('Greg',     '10'), 
('Jeff',     '20')

Answer 1

这应该有效：

SELECT AVG(tt.Sales) AS Median 
FROM (
    SELECT TOP 1 t1.* FROM 
    (SELECT TOP 50 PERCENT FROM @T ORDER BY Sales) t1
    ORDER BY t1.Sales DESC
    UNION
    SELECT TOP 1 t2.* FROM 
    (SELECT TOP 50 PERCENT FROM @T ORDER BY Sales  DESC) t2
    ORDER BY t2.Sales
) tt

要显示它，你可以

DECLARE @Median REAL
SELECT @Median=AVG(tt.Sales) AS Median 
FROM (
    SELECT TOP 1 t1.* FROM 
    (SELECT TOP 50 PERCENT FROM @T ORDER BY Sales) t1
    ORDER BY t1.Sales DESC
    UNION
    SELECT TOP 1 t2.* FROM 
    (SELECT TOP 50 PERCENT FROM @T ORDER BY Sales  DESC) t2
    ORDER BY t2.Sales
) tt

PRINT CONVERT(VARCHAR, @Median)

显示动态表中的中值

1 个答案: