Mysql implements two methods to add serial numbers to simple query results

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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