MYSQL UPDATE SET 在同一列上但具有多个 WHERE 子句

Question

对于 MYSQL，我正在使用这个查询:

UPDATE CustomerDetails_COPY
SET Category_ID = 10
WHERE Category_ID = 2

很好，但我想向它添加 15 多个 SET/WHERE 广告，例如:

UPDATE CustomerDetails_COPY
SET Category_ID = 9  WHERE Category_ID = 3
SET Category_ID = 12 WHERE Category_ID = 4
SET Category_ID = 11 WHERE Category_ID = 5
.....

我该如何添加？

编辑:

根据猎人的建议:

UPDATE CustomerDetails_COPY
    SET Category_ID = CASE Category_ID
        WHEN 2 THEN 10 
        WHEN 3 THEN 9
        WHEN 4 THEN 12
        WHEN 5 THEN 11
    END
WHERE Category_ID IN (2,3,4,5)

这很好用!谢谢

Answer 1

像这样的东西应该适合你:

UPDATE CustomerDetails_COPY
    SET Category_ID = CASE Category_ID
        WHEN 2 THEN 10 
        WHEN 3 THEN 9
        WHEN 4 THEN 12
        WHEN 5 THEN 11
    END
WHERE Category_ID IN (2,3,4,5)

或者，正如 Simon 所建议的，您可以这样做以避免输入两次值:

UPDATE CustomerDetails_COPY
    SET Category_ID = CASE Category_ID
        WHEN 2 THEN 10 
        WHEN 3 THEN 9
        WHEN 4 THEN 12
        WHEN 5 THEN 11
        ELSE Category_ID
    END

来源:http://www.karlrixon.co.uk/writing/update-multiple-rows-with-different-values-and-a-single-sql-query/