Question

如何在MySQL中执行以下操作：

UPDATE PartTbl SET aFlag = 0 
WHERE PartId = (SELECT PartId FROM CategoryTbl WHERE cat = 100)

Answer 1

UPDATE PartTbl SET aFlag = 0 
WHERE PartId IN (SELECT PartId FROM CategoryTbl WHERE cat = 100)

Answer 2

只需在WHERE子句中使用"IN"代替"="运算符，或使用以下代码：

UPDATE A
    SET aFlag = 0
    From    PartTbl     As  A
    Inner   Join
        CategoryTbl As  B
    On  A.PartId    =   B.PartId
    WHERE B.cat = 100

Answer 3

UPDATE PartTbl pt SET aFlag = 0 
WHERE exists (
   SELECT PartId FROM CategoryTbl ct 
    WHERE cat = 100 and pt.partId = ct.partId)

更新另一个表等于某个值的位置

3 个答案: