MySQL 给数据排序同时追加序号列

2024年5月30日 236次阅读 来源: 葬天尘

  • 无分组

    select @rownum:=@rownum+1 as autoSeq,
sid,pid,oprimary,seq
from singlechoice,(select @rownum:=0) r
order by pid,sid

  • 单字段分组

    select (@i := case  when  @tableName=a.tablename then @i + 1 else 1 end )  as rowIndex,
a.*,(@tableName:=a.tablename)
from tablestyle a,(select @i:=0,@tableName:='') as t
group by tablename,fieldname
order by tablename,(@i := case  when  @tableName=a.tablename then @i + 1 else 1 end )

  • 多字段分组

    select (@i := case  when  @tableName=concat(a.dbname,a.tablename) then @i + 1 else 1 end )  as rowIndex,
a.*,(@tableName:=concat(a.dbname,a.tablename)) as temp
from tablestyle a,(select @i:=0,@tableName:='') as t
group by dbname,tablename,fieldname
order by dbname,tablename,(@i := case  when  @tableName=concat(a.dbname,a.tablename) then @i + 1 else 1 end )
    原文作者：葬天尘
    原文地址: https://segmentfault.com/a/1190000017914488
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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