摘要:
一、删除数据提示有外键约束 二、直接删掉或者先删掉关联表外键的数据再来删除主表的数据 SET foreign_key_checks = 0;关掉约束 delete from t_xxx where xxxid = '60';执行删除数据 SET foreign_key_checks = 1;打开约束 阅读全文
摘要:
一、错误 > 1055 - Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'n.wifi_mac' which is not functionally dependen 阅读全文