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當他們有兩個成年人和一個孩子正在預訂時,我給用戶打折時遇到了很多困難......輸出文本是說如標題所示。雖然我意識到這個問題,但我不確定我如何解決它以使結果更加獨特。'子查詢返回多於一行'使用案例
僅供參考,價格來自不同的表格,但其他一切都在預訂中。
任何幫助表示讚賞,並在此先感謝
UPDATE BOOKING SET TotalCost=
(SELECT SUM(
CASE WHEN NumAdults = 2 AND NumChilds = 1 THEN
(NumAdults*(SELECT Cost FROM prices WHERE AgeType = 'Adult'))
+
(NumChilds*(SELECT Cost FROM prices WHERE AgeType = 'Child'/2))
ELSE
(NumAdults*(SELECT Cost FROM prices WHERE AgeType = 'Adult'))
+
(NumChilds*(SELECT Cost FROM prices WHERE AgeType = 'Child'))
END
))
WHERE BookID = 1
考慮提供創建和插入語句,以及期望的結果 – Strawberry