分组依据检索 3 个值

我有以下查询

SELECT  Cod ,
        MIN(Id) AS id_Min,
        MAX(Id) AS id_Max,
        -- retrieve value in the middle,
        COUNT(*) AS Tot

FROM    Table a ( NOLOCK )        
GROUP BY Cod
HAVING  COUNT(*)=3

我怎样才能像我对最小值和最大值所做的那样检索最小值和最大值之间的值？

EXAMPLES

Cod      |  Id

Stack       10
Stack       15
Stack       11
Overflow    100
Overflow    120
Overflow    15

所需输出

Cod         | Min   | Value_In_The_Middle  |    Max

Stack         10          11                    15
Overflow      15          100                   120

我还没有测试过，但我认为这会起作用

SELECT  Cod ,
        MIN(Id) AS id__Min,
        MAX(Id) AS id_Max,
        SUM(ID)-MAX(Id)-MIN(Id) as id_Middle,
        COUNT(*) AS Tot
FROM    Table a ( NOLOCK )        
GROUP BY Cod
HAVING  COUNT(*)=3

这个技巧仅在你有 3 个值并且 SUM() 不会溢出时才有效（例如博格丹·萨赫林 https://stackoverflow.com/users/924077/bogdan-sahlean在评论中指出）。