Mysql查询结果添加序列号
第一种方法：
select (@i:=@i+1) as i,table_name.* from table_name,(select @i:=0) as it ;第二种方法：
set @rownum=0;
select @rownum:=@rownum+1 as rownum, t.username from auth_user t limit 1,5;第一种方法：
select (@i:=@i+1) as i,table_name.* from table_name,(select @i:=0) as it ;第二种方法：
set @rownum=0;
select @rownum:=@rownum+1 as rownum, t.username from auth_user t limit 1,5;