如何從MariaDB的不同表中更新多列

Question

我正在使用MariaDB。我試圖從SELECT不同的表中更新兩列。

UPDATE User U 
SET 
    U.UserPoint = (
     SELECT ((SELECT COUNT(*) 
       FROM CARD_COMM R 
       WHERE R.Card_ID = C.Card_ID) * 3 
       + 
       (SELECT COUNT(*) 
       FROM SECTION_CARD_LIKE L 
       WHERE L.Card_ID = C.Card_ID) * 1) as userPoint 
       FROM CARD C WHERE C.userid = U.userid ORDER BY userPoint DESC limit 1) 

這個作品

UPDATE User U 
SET 
    (U.UserPoint, U.Card) = (
     SELECT ((SELECT COUNT(*) 
       FROM CARD_COMM R 
       WHERE R.Card_ID = C.Card_ID) * 3 
       + 
       (SELECT COUNT(*) 
       FROM SECTION_CARD_LIKE L 
       WHERE L.Card_ID = C.Card_ID) * 1) as userPoint, 
       C.Card_ID as card 
       FROM CARD C WHERE C.userid = U.userid ORDER BY userPoint DESC limit 1) 

但這個劑量不....

如何做到這一點？ 請幫我...

Answer 1

使用多表更新，像

UPDATE User 
    JOIN (SELECT userid, up_value, card_value ...) AS x 
     ON x.userid = User.userid 
    SET User.UserPoint = x.up_value, 
     User.Card = x.card_value; 

（用合適的表達式/子查詢/等，爲up_value & card_value）

你似乎更新所有用戶行