sql server分組結果

Question

這個查詢返回它下面的列表，但是ids出現多次，我可以分組ids並加起來所有的戲劇，所以我只是得到一個列表唯一ID與它旁邊的戲劇總數。這是可能的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

當使用GROUP BY，在SELECT的所有數據項，必須被包括在GROUP BY或放置在Aggregate Function。

因此，fkPlayerId應進行分組，並與SUM()功能

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

要ORDER BY聚合函數使用plays，給這個數據項的別名，訂購：

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