摘要:
转自https://blog.csdn.net/weixin_44145478/article/details/107079176 mysql文档中对于dual表的解释: You are allowed to specify DUAL as a dummy table name in situati 阅读全文
摘要:
https://blog.csdn.net/weixin_42409107/article/details/100074210 Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated colu 阅读全文