摘要: 把 转成 SELECT substring_index(substring_index( a.rn,',',b.help_topic_id + 1 ),',' ,- 1) AS rn FROM (select '1,2,3,4' as rn) a JOIN mysql.help_topic b ON 阅读全文
posted @ 2020-08-20 15:02 苏su 阅读(4974) 评论(0) 推荐(0) 编辑