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当他们有两个成年人和一个孩子正在预订时,我给用户打折时遇到了很多困难......输出文本是说如标题所示。虽然我意识到这个问题,但我不确定我如何解决它以使结果更加独特。'子查询返回多于一行'使用案例
仅供参考,价格来自不同的表格,但其他一切都在预订中。
任何帮助表示赞赏,并在此先感谢
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
考虑提供创建和插入语句,以及期望的结果 – Strawberry