How to show sequential number in MySQL query result

Question

I have some simple query:

SELECT foo, bar FROM table

i think you now whats the result looks like.

What I want to do is to show some

Answer 1

If somebody wants to display the row number after ordering records, something like this may work

set @a=0; 
select @a:=@a+1 serial_number,t.* 
from ( SELECT foo, bar FROM tableORDER BY bar ) t