一、两张表之间的数据迁移
UPDATE school_rankings SET contents = (SELECT contents FROM school_details WHERE school_details.`id`=school_rankings.id)
这句sql性能较低,只能一列一列的进行数据的迁移。工作繁忙,先保存一下,有空再深入探讨
一、两张表之间的数据迁移
UPDATE school_rankings SET contents = (SELECT contents FROM school_details WHERE school_details.`id`=school_rankings.id)
这句sql性能较低,只能一列一列的进行数据的迁移。工作繁忙,先保存一下,有空再深入探讨