摘要: select 0 AS id,mac, file_md5,substring_index(substring_index(a.type_str,',',b.help_topic_id+1),',',-1) as type_val from ( SELECT mac, file_md5, concat 阅读全文
posted @ 2021-04-08 09:32 勤奋的园 阅读(137) 评论(0) 推荐(0) 编辑