SQL Server 2014 LAST_VALUE GROUP BY

Question

是否可以在GROUP BY select語句中使用LAST_VALUE關鍵字？

SELECT colA, 
     LAST_VALUE(colB) 
      OVER (PARTITION BY ... ORDER BY ... ROWS BETWEEN ...) 
FROM MyTable 
GROUP BY colA 

Answer 1

我不認爲window功能可用於group by。可能是sub-select會做這個工作

select colA,L_values 
from 
(
SELECT colA, 
     LAST_VALUE(colB) 
      OVER (PARTITION BY ... ORDER BY ... ROWS BETWEEN ...) L_Value 
FROM MyTable 
) a 
group by colA,L_values