sql server分组结果

Question

这个查询返回它下面的列表，但是ids出现多次，我可以分组ids并加起来所有的戏剧，所以我只是得到一个列表唯一ID与它旁边的戏剧总数。这是可能的SQL？

SELECT [fkPlayerId],[plays] 
FROM [dPlaysPerDay] 
INNER JOIN dWinners 
ON [dPlaysPerDay].[fkPlayerId]=dWinners.[pkWinnerId] 

53693 1 
53695 1 
53696 1 
53693 1 
53692 2 
53698 2 
53697 1 
53699 2 
53698 3 
53693 6 
53699 2 
53693 2 
53700 2 
53698 1 

Answer 1

当使用GROUP BY，在SELECT的所有数据项，必须被包括在GROUP BY或放置在Aggregate Function。

因此，fkPlayerId应进行分组，并与SUM()功能

SELECT [fkPlayerId], SUM([plays]) 
FROM [dPlaysPerDay] 
INNER JOIN dWinners ON [dPlaysPerDay].[fkPlayerId]=dWinners.[pkWinnerId] 
GROUP BY fkPlayerId 

要ORDER BY聚合函数使用plays，给这个数据项的别名，订购：

SELECT [fkPlayerId], SUM([plays]) as TotalPlays 
FROM [dPlaysPerDay] 
INNER JOIN dWinners ON [dPlaysPerDay].[fkPlayerId]=dWinners.[pkWinnerId] 
GROUP BY fkPlayerId 
ORDER BY TotalPlays