MySQL 相关项目
如题的语句在mysql中报错：You can't specify target table table_1 for update in FROM clause
解决办法是：
UPDATE table_1 SET set...
WHERE
table_1.x = (
SELECT pick.id FROM (SELECT tmp.id FROM table_1 tmp WHERE tmp.x = ? AND tmp.x = ?) pick )
但是这个语句的性能是不是不如分步操作的性能呢？
解决办法是：
UPDATE table_1 SET set...
WHERE
table_1.x = (
SELECT pick.id FROM (SELECT tmp.id FROM table_1 tmp WHERE tmp.x = ? AND tmp.x = ?) pick )
但是这个语句的性能是不是不如分步操作的性能呢？
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