SQL Server子查詢返回錯誤

Question

當我嘗試執行語句時，出現錯誤，返回“子查詢返回的值超過1個。不允許...”，其余的您都知道。 我對子查詢不滿意，實際上有時會反復嘗試，直到我看到要收集的結果為止。 誰能向我解釋為什么返回此錯誤的問題？

我試圖返回一個人的游戲得分，然后再繼續返回同一游戲中的所有玩家。

如果數據相關，則文件位於此處： SQL文件

SELECT
 TP.intPlayerID
,TP.strLastName + ', ' + TP.strFirstName AS strPlayerName
,TG.*
,TR.intGameID
,(
    SELECT
        CASE WHEN Game.F1S1 = 10 and Game.F2S1 = 10 THEN 20 + Game.F3S1
             WHEN Game.F1S1 = 10 and Game.F2S1 < 10 THEN 10 + Game.F2S1 + Game.F2S2
             WHEN Game.F1S1 + Game.F1S2 = 10 THEN 10 + Game.F2S1
             ELSE Game.F1S1 + Game.F1S2 
             END
        +
        CASE WHEN Game.F2S1 = 10 and Game.F3S1 = 10 THEN 20 + Game.F4S1
             WHEN Game.F2S1 = 10 and Game.F3S1 < 10 THEN 10 + Game.F3S1 + Game.F3S2
             WHEN Game.F2S1 + Game.F2S2 = 10 THEN 10 + Game.F3S1
             ELSE Game.F2S1 + Game.F2S2
             END
        +
        CASE WHEN Game.F3S1 = 10 and Game.F4S1 = 10 THEN 20 + Game.F5S1
             WHEN Game.F3S1 = 10 and Game.F4S1 < 10 THEN 10 + Game.F4S1 + Game.F4S2
             WHEN Game.F3S1 + Game.F3S2 = 10 THEN 10 + Game.F4S1
             ELSE Game.F3S1 + Game.F3S2
             END
        +
        CASE WHEN Game.F4S1 = 10 and Game.F5S1 = 10 THEN 20 + Game.F6S1
             WHEN Game.F4S1 = 10 and Game.F5S1 < 10 THEN 10 + Game.F5S1 + Game.F5S2
             WHEN Game.F4S1 + Game.F4S2 = 10 THEN 10 + Game.F5S1
             ELSE Game.F4S1 + Game.F4S2
             END
        +
        CASE WHEN Game.F5S1 = 10 and Game.F6S1 = 10 THEN 20 + Game.F7S1
             WHEN Game.F5S1 = 10 and Game.F6S1 < 10 THEN 10 + Game.F6S1 + Game.F6S2
             WHEN Game.F5S1 + Game.F5S2 = 10 THEN 10 + Game.F6S1
             ELSE Game.F5S1 + Game.F5S2
             END
        +
        CASE WHEN Game.F6S1 = 10 and Game.F7S1 = 10 THEN 20 + Game.F8S1
             WHEN Game.F6S1 = 10 and Game.F7S1 < 10 THEN 10 + Game.F7S1 + Game.F7S2
             WHEN Game.F6S1 + Game.F6S2 = 10 THEN 10 + Game.F7S1
             ELSE Game.F6S1 + Game.F6S2
             END
        +
        CASE WHEN Game.F7S1 = 10 and Game.F8S1 = 10 THEN 20 + Game.F9S1
             WHEN Game.F7S1 = 10 and Game.F8S1 < 10 THEN 10 + Game.F8S1 + Game.F8S2
             WHEN Game.F7S1 + Game.F7S2 = 10 THEN 10 + Game.F8S1
             ELSE Game.F7S1 + Game.F7S2
             END
        +
        CASE WHEN Game.F8S1 = 10 and Game.F9S1 = 10 THEN 20 + Game.F10S1
             WHEN Game.F8S1 = 10 and Game.F9S1 < 10 THEN 10 + Game.F9S1 + Game.F9S2
             WHEN Game.F8S1 + Game.F8S2 = 10 THEN 10 + Game.F9S1
             ELSE Game.F8S1 + Game.F8S2
             END
        +
        CASE WHEN Game.F9S1 = 10 and Game.F10S1 = 10 THEN 20 + Game.F10S2
             WHEN Game.F9S1 = 10 and Game.F10S1 < 10 THEN 10 + Game.F10S1 + Game.F10S2
             WHEN Game.F9S1 + Game.F9S2 = 10 THEN 10 + Game.F10S1
             ELSE Game.F9S1 + Game.F9S2
             END
        +
        CASE WHEN Game.F10S1 = 10 and Game.F10S2 = 10 THEN 20 + Game.F10S3
             WHEN Game.F10S1 = 10 and Game.F10S2 < 10 THEN 10 + Game.F10S2 + Game.F10S3
             WHEN Game.F10S1 + Game.F10S2 = 10 THEN 10 + Game.F10S3
             ELSE Game.F10S1 + Game.F10S2
             END 
        AS GameScore
    FROM 
        (   
            SELECT
                TR.intGameID
                ,SUM( CASE WHEN TR.intRollIndex = 1 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F1S1
                ,SUM( CASE WHEN TR.intRollIndex = 1 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F1S2
                ,SUM( CASE WHEN TR.intRollIndex = 2 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F2S1
                ,SUM( CASE WHEN TR.intRollIndex = 2 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F2S2
                ,SUM( CASE WHEN TR.intRollIndex = 3 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F3S1
                ,SUM( CASE WHEN TR.intRollIndex = 3 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F3S2
                ,SUM( CASE WHEN TR.intRollIndex = 4 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F4S1
                ,SUM( CASE WHEN TR.intRollIndex = 4 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F4S2
                ,SUM( CASE WHEN TR.intRollIndex = 5 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F5S1
                ,SUM( CASE WHEN TR.intRollIndex = 5 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F5S2
                ,SUM( CASE WHEN TR.intRollIndex = 6 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F6S1
                ,SUM( CASE WHEN TR.intRollIndex = 6 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F6S2
                ,SUM( CASE WHEN TR.intRollIndex = 7 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F7S1
                ,SUM( CASE WHEN TR.intRollIndex = 7 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F7S2
                ,SUM( CASE WHEN TR.intRollIndex = 8 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F8S1
                ,SUM( CASE WHEN TR.intRollIndex = 8 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F8S2
                ,SUM( CASE WHEN TR.intRollIndex = 9 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F9S1
                ,SUM( CASE WHEN TR.intRollIndex = 9 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F9S2
                ,SUM( CASE WHEN TR.intRollIndex = 10 and TR.intRollNumberIndex = 1 THEN TR.intNumberOfPins ELSE 0 END ) F10S1
                ,SUM( CASE WHEN TR.intRollIndex = 10 and TR.intRollNumberIndex = 2 THEN TR.intNumberOfPins ELSE 0 END ) F10S2
                ,SUM( CASE WHEN TR.intRollIndex = 10 and TR.intRollNumberIndex = 3 THEN TR.intNumberOfPins ELSE 0 END ) F10S3
            FROM
                TRolls AS TR
            GROUP BY
                TR.intGameID ) AS Game )
FROM
     TPlayers AS TP
    ,TGames AS TG
    ,TRolls AS TR
WHERE
    TP.intPlayerID = TG.intPlayerID
    AND TG.intGameID = TR.intGameID
    AND TP.intPlayerID = 21

Answer 1

如果沒有表設計，調試起來會有點困難，但是從我在查詢中看到的情況來看，可能會有一些問題（再次取決於表設計）。

1. 您的內部子查詢沒有Where語句。 因此，它將把所有游戲都歸入intGameID分組的TRolls表中； 它將返回多個游戲； 這可能是問題所在，因為在SELECT語句中使用了“游戲”子查詢，因此它應該只返回一行； 您可能需要向您的子查詢中添加WHERE子句，並可能需要另一個聯接，具體取決於您的表結構及其關系。 如果您確實需要獲取每個游戲的分數（意味着您還不知道gameID），則需要在FROM語句中（而不是在select語句中）這樣做

   SELECT TP.intPlayerID ,TP.strLastName + ', ' + TP.strFirstName AS strPlayerName ,TG.* ,TR.intGameID , Game.Gamescore FROM TPlayers AS TP ,TGames AS TG ,TRolls AS TR , (Select ... ... ) As Game WHERE ...

2. 根據您的問題，我知道在一個游戲中您有多個玩家。 您只過濾了“ PlayerID = 21”，所以您要添加該玩家從所有游戲中獲得的所有分數-這是您真正想要的嗎？ 還是您錯過了篩選特定游戲的其他條件？

您提到您不熟悉子查詢，因此這里有一個快速的經驗法則：

• 如果在Select語句（如您的語句）中使用，則子查詢只能返回一行。 總是。
• 如果在From語句中使用（如我的示例），它將為您帶來一個具有多行的虛擬“臨時表”，將其括在括號中並使用Alias進行標識； 然后使用給定的別名將其與From語句中的其他表聯接。

• 如果在Where語句中使用，它應該返回一個布爾值（true或false），一個常見的例子是驗證某處是否存在信息，例如：

  WHERE EXISTS (SELECT 'X' from .... Where ....)