Median in SQL Server 2000

For even rows formula for median is (104.5 + 108)/2 for table below and For odd rows it is 108 for table below

Total       Total

100         100
101         101
104.5       104.5
108         108
108.3       108.3
112         112
            114

Code be开发者_Python百科low works in SQL Server 2008 but not in SQL Server 2000 as it does not understand row_number() and over.

How can we change the lower code to make it work on SQL Server 2000?

select avg(Total) median from
(select Total, 
rnasc = row_number() over(order by Total),
rndesc = row_number() over(order by Total desc)
 from [Table] 
) b
where rnasc between rndesc - 1 and rndesc + 1

If you only want a median, you may use this simple query.

SELECT
(
  (SELECT MAX(Total) FROM
    (SELECT TOP 50 PERCENT Total FROM [Table] ORDER BY Total) AS BottomHalf)
  +
  (SELECT MIN(Total) FROM
    (SELECT TOP 50 PERCENT Total FROM [Table] ORDER BY Total DESC) AS TopHalf)
) / 2.0 AS Median

Source: Function to Calculate Median in Sql Server

SELECT Median = AVG(Total) FROM 
( 
    SELECT Total FROM ( 
        SELECT TOP 1 Total = Total * 1.0 FROM 
        ( 
            SELECT TOP 50 PERCENT Total 
            FROM dbo.[Table] ORDER BY Total 
        ) AS sub_a 
        ORDER BY 1 DESC 
    ) AS sub_1 
    UNION ALL 
    SELECT Total FROM ( 
        SELECT TOP 1 Total = Total * 1.0 FROM 
        ( 
            SELECT TOP 50 PERCENT Total 
            FROM dbo.[Table] ORDER BY Total DESC 
        ) AS sub_b 
        ORDER BY 1 
    ) AS sub_2 
) AS median;