MySQL SELECT Counter, Group By

Question

im not sure if what I am asking for is possible... but it probably is lol.

Basically, I have two tables, tracks and albums.

I want to display a list of all track

Answer 1

We need to do something like ROW_NUMBER() OVER(Partition By AlbumTitle). Based on the trick defined in this article for Analytical functinons in MySQl.

SELECT MO.*,
       @_rowNumber := @_rowNumber + 1
  FROM
       (
        SELECT m.*
          FROM
               (
                Select @_albumTitle := NULL
               ) V,
               (
                SELECT tbl_tracks.title As TrackTitle, 
                       tbl_albums.title As AlbumTitle
                  FROM tbl_tracks, 
                       tbl_albums 
                 WHERE tbl_tracks.album_id = tbl_albums.id
               ) m
         ORDER BY m.AlbumTitle,m.TrackTitle
       ) MO
 WHERE (CASE WHEN @_albumTitle IS NULL 
               OR @_albumTitle <> MO.AlbumTitle THEN @_rowNumber := 0 END IS NOT NULL)
   AND (@_albumTitle := MO.AlbumTitle) IS NOT NULL

NOTE: I have experience only in MS SQL, so this query may be wrong syntactically. And this query is Untested in MySql. I just read the code from article above and tried to follow the same approach.

Answer 2

SELECT @rn := if(@g = tbl_albums.id, @rn+1, 1) rownumber,
       tbl_tracks.title, tbl_albums.title,
  @g := tbl_albums.id
FROM (select @g:=null, @rn:=0) initvars
CROSS JOIN tbl_tracks
INNER JOIN tbl_albums on tbl_tracks.album_id = tbl_albums.id
ORDER BY tbl_albums.id, tbl_tracks.title;