SQL 更新到其联接值的 SUM [英] SQL Update to the SUM of its joined values

问题描述

我正在尝试将数据库中的字段更新为其连接值的总和:

I'm trying to update a field in the database to the sum of its joined values:

UPDATE P
SET extrasPrice = SUM(E.price)
FROM dbo.BookingPitchExtras AS E
INNER JOIN dbo.BookingPitches AS P ON E.pitchID = P.ID
    AND P.bookingID = 1
WHERE E.[required] = 1

运行时出现以下错误:

"An aggregate may not appear in the set list of an UPDATE statement."

有什么想法吗?

推荐答案

这个怎么样:

UPDATE p
SET p.extrasPrice = t.sumPrice
FROM BookingPitches AS p
INNER JOIN
    (
        SELECT PitchID, SUM(Price) sumPrice
        FROM BookingPitchExtras
        WHERE [required] = 1
        GROUP BY PitchID 
    ) t
    ON t.PitchID = p.ID
WHERE p.bookingID = 1

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