Question

i have a mysql result set like bellow

id        name
---------------------
1         abc
1         abc
2         xyz
2         xyz
3         pqr

now i need to modify the result set so that it would be like as follows:

id        name
---------------------
1         abc-1
1         abc-2
2         xyz-1
2         xyz-2
3         pqr

the summarization is i need to numbering the name column from result set and the numbering will only apply on the rows which have more than one value in the result set.

so what will be the MySQL SELECT Query?

Answer 1

this might work but there’s probably a better way that i can’t think of right now

set @i = 0;

select
 f.id,
 @i:=@i+1 as i,
 case 
  when c.counter <= 1 then f.name 
  else concat(f.name,'-',(@i % c.counter) +1)
 end as name
from
 foo f
join (select id, count(*) as counter from foo group by id) c on c.id = f.id
order by
 f.id,name;

EDIT: as stated in comments above, better to do this at the app level vs. db