mysql SQL语句You can't specify target table ' for update in FROM clause解决
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昨天执行了这样一个批量删除的语句
DELETEFROMbd_countryWHEREid IN (SELECTidFROMbd_countryWHEREstatecode IS NULLAND citycode IS NULLAND nameCN IS NULL)然后出现了 [Err] 1093 - You can't specify target table 'bd_country' for update in FROM clause的错误，当时很纳闷 一直这样写的怎么会出现问题呢，它的意思是（你不能在FROM子句指定目标表更新），我想了想是不是以前我一直用的Oracle，Oracle可以但是Mysql不可以。
解决思路：既然Mysql不让对查询到的目标语句进行更新，那么我在它的上面在套一个子查询就可以。
DELETEFROMbd_countryWHEREid IN (SELECTtmp.idFROM(SELECTidFROMbd_countryWHEREstatecode IS NULLAND citycode IS NULLAND nameCN IS NULL) tmp)
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