12 2018 档案

sql分组和连接
摘要：SELECT mr.member_id, mr.username, GROUP_CONCAT(DISTINCT jb.company,jb.start_time,jb.end_time)companys, GROUP_CONCAT(DISTINCT en.school)school, CONCAT(jb.company,'-',en.school) wawwa, GROUP_CONCAT(... 阅读全文
posted @ 2018-12-14 19:40 adstat 阅读(507) 评论(0) 推荐(0)