The example of this article describes the mysql simple method of adding serial numbers to query results. Share it with everyone for your reference, the details are as follows:
First method:
select (@i:=@i+1) as i,table_name.* from table_name,(select @i:=0) as it
Second method:
set @rownum=0; select @rownum:=@rownum+1 as rownum, t.username from auth_user t limit 1,5;
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