Question

我不小心跑了两次查询，数据库中的所有点都弄乱了（3000条记录）。

每个结果的前4个都有固定的结果，但计算了最后一个和第五个之间的分数（最后是100分）。

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我基本上需要将此语句转换为SQL：

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

如何获取select语句以分别引用Select和Update表。这不起作用：

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

我会预先计算最高值并在执行UPDATE之前将它们存储在临时表中：

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，我不确定如何定义NumberOfResults和NumberOfPlaces。您正在选择最高位置，但从不计算任何数字。也许你可以将它添加到SELECT：

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

Answer 2

只需要使用“FROM”

从正确的表中显示更新

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)

搞砸了SQL数据 - 在update语句中选择

2 个答案: