Need help with PHP and MySQL…

Question

I have a table of songs, some songs are album song, and some are singles... And I have a table of albums...

Songs table cols: Song_ID, Album_ID, Song_Name, Date_Released, Timestamp_Released , others... If the Album_ID is [null] , it means the song is a single

Albums table cols: Album_ID, Album_Name, Song_IDs, Date_Released , others...

Note 1: there is no Timestamp_Released in albums table

Note 2: Date_Released is only a day with no time ie "2011-06-16"

I'm currently using this query to display a table (in my html/php page) that each row is a single or a album (songs that are in an album are displayed all in one row as album)

SELECT 
    IF(Album_ID IS NULL,s.Song_Name,a.Album_Name) as name, 
    IF(Album_ID IS NULL,s.Date_Released,a.Date_Released) as datereleased, 
    s.Timestamp_Released
FROM songs s LEFT JOIN albums a ON (s.Album_ID = a.Album_ID)
GROUP BY 1,2
ORDER BY 2 DESC,1
LIMIT 0,10; 

The query above order the list of songs and albums according to date and give the albums the Date_Released and Timestamp_Released of the oldest song in the album...

So my question is how to give the album the Date_Released and Timestamp_Released of the newest song in it ?

Thank you :)

Answer 1

Instead of s.Date_Released, s.Timestamp_Released write MAX(s.Date_Released) as Newest_Date_Released, MAX(s.Timestamp_Released) as Newest_Timestamp_Releasd UPDATE

SELECT 
IF(Album_ID IS NULL,s.Song_Name,a.Album_Name) as name, 
MAX(IF(Album_ID IS NULL,s.Date_Released,a.Date_Released)) as datereleased, 
MAX(s.Timestamp_Released)
FROM songs s LEFT JOIN albums a ON (s.Album_ID = a.Album_ID)
GROUP BY 1
ORDER BY 2 DESC,1
LIMIT 0,10;