如何在一个MySQL查询中进行2次更新

Question

在MySQL查询中

如何在一个查询中进行2次更新，查询如下：

UPDATE `stats` SET `coin` = coin + 500 WHERE `player` = 'userone'
UPDATE `stats` SET `coin` = coin - 500 WHERE `player` = 'usertwo'

Answer 1

您可以使用case和in：

UPDATE `stats`
    SET `coin` = coin + (case when player = 'userone' then 500 else -500 end)
    WHERE `player` in ( 'userone', 'usertwo');

Answer 2

UPDATE stats
SET coin = CASE player
            WHEN 'userone' THEN coin + 500
            WHEN 'usertwo' THEN coin - 500
           END
WHERE player IN ('userone', 'usertwo')