摘要: sql语句: select a.id,substring_index(substring_index(a.name,',',b.help_topic_id+1),',',-1) name from test a join mysql.help_topic b on b.help_topic_id < 阅读全文
posted @ 2020-09-25 14:19 正怒月神 阅读(791) 评论(0) 推荐(0)