搞砸了SQL數據 - 在更新語句中選擇

Question

我意外地運行了一次查詢兩次，並且我的數據庫中的所有點都弄亂了（3000條記錄）。每個結果

4強已經固定去年和5之間的結果，但點計算（去年是100pts）。

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我基本上是需要這個語句轉換爲SQL：

分= 100 +（（100 /（NumberOfResults - 4））*（NumberOfResults - PositionOfResult））

如何獲得select語句以分別引用Select和Update表。這不起作用：

UPDATE Results R1 
SET  R1.Points = 100 + ((100/((SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC)-4) * ((SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC)-R1.Position))) 
WHERE  R1.ContestID > 11 
AND  R1.Position > 4 
AND  R1.Position < (SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC) 

Answer 1

只是需要更新，從正確的表顯示了使用「FROM」

UPDATE R1 
SET  R1.Points = 100 + ((100/((SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC)-4) * ((SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC)-R1.Position))) 
From  Results R1 
WHERE  R1.ContestID > 11 
AND  R1.Position > 4 
AND  R1.Position < (SELECT TOP 1 R2.Position FROM Results R2 WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID ORDER BY R2.Position DESC) 

Answer 2

我會預先計算的頂值和執行更新之前臨時表它們存儲：

SELECT 
    R1.Date, 
    R1.ContestID, 
    (SELECT TOP 1 R2.Position 
    FROM Results R2 
    WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID 
    ORDER BY R2.Position DESC) AS TopPosition 
INTO #temp 
FROM 
    (SELECT DISTINCT Date, ContestID FROM Results) R1; 

UPDATE Results R 
SET R.Points = 100 + ((100/((SELECT TopPosition FROM #temp T 
           WHERE T.Date = R.Date AND 
             T.ContestID = R.ContestID)-4) * 
          ((SELECT TopPosition FROM #temp T 
           WHERE T.Date = R.Date AND 
            T.ContestID = R.ContestID)-R.Position))) 
WHERE R.ContestID > 11 
AND R.Position > 4 
AND R.Position < (SELECT TopPosition FROM #temp T 
        WHERE T.Date = R.Date AND T.ContestID = R.ContestID); 

但是，我不知道如何NumberOfResults和NumberOfPlaces被定義。您正在選擇頂部位置，但從不計算任何數字。也許你可以將它添加到SELECT：

..., 
(SELECT COUNT(*) 
FROM Results R2 
WHERE R2.Date = R1.Date AND R2.ContestID = R1.ContestID) AS NumberOfResults 
INTO ...