sql - 分组依据检索 3 个值

Question

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

如何像获取最小值和最大值一样检索最小值和最大值之间的值？

示例

Cod      |  Id

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

所需的输出

Cod         | Min   | Value_In_The_Middle  |    Max

Stack         10          11                    15
Overflow      15          100                   120

Answer 1

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

此技巧仅在您有 3 个值且 SUM() 不会溢出时才有效(如评论中指出的 Bogdan Sahlean )。