GROUP BY中的SQL Server 2014 LAST_VALUE

Question

是否可以在LAST_VALUE select语句中使用GROUP BY关键字？

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

Answer 1

我不认为window功能可用于group by。可能sub-select将完成工作

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