Question

I need to select the “bundle” entries from the table below but only if a bundle exists other wise select track 1 from each release. Each release has a unique “cat_no” which is why I need to use GROUP BY.

SELECT * FROM cds  
WHERE genre='rock'  
GROUP BY cat_no  
ORDER BY ABS(track) DESC  
LIMIT 0,3

This what I have tried but I am sometimes getting track 1 when there is a bundle for that release.

Table

genre cat_no  track  
rock  001     1      
rock  001     2      
rock  001     bundle 
rock  002     1      
rock  002     2      
rock  002     bundle 
rock  003     1     
rock  003     2      

Answer 1

Try to sort records before the grouping –

SELECT * FROM
  (SELECT * FROM cds WHERE genre = 'rock' ORDER BY IF(track = 'bundle', 0, 1)) t
GROUP BY
  cat_no;