我对这个mysql查询有疑问。执行vmore需要1天...查询是:INSERTINTOtraduction(traduction.`id`,traduction.`traduction`,traduction.`language`,traduction.`type`)(SELECTcities.id,cities.name,'','city'FROMcitiesWHEREcities.idNOTIN(SELECTtraduction.`id`FROMtraductionWHEREtraduction.type='city'GROUPBYid));我对第二个选择进行了扩展解释，上面写着D