Do I use a subquery or group by

Using MySQL, I'm looking to get the sum dollar amount of all licenses in our system, broken out or grouped by album.  Our albums are stored as 6 character codes, example ABC001.  Unfortunately the license tables don't store album, only the album_track, which is the album code with a number appended, example ABC001_12.  So I have to do a fuzzy search for 'ABC001%'.  

I'm able to run this query to get the summed license values:

SELECT SUM(a.LicenseAmount)
FROM db1.sync_license_apps a
inner join db1.sync_license_apps_music_used b
on a.appl_ReferenceID = b.fk_appl_ReferenceID
where appl_musicUsedTrackCatNumber like 'ABC001%';

The problem is that I want to essentially run this as a subquery to my Albums table - SELECT album_code from albums.  But I can't do this because I have to use a LIKE filter.

Any idea how to accomplish this?  Thanks!
XbraddersAsked:
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Koen Van WielinkBusiness Intelligence SpecialistCommented:
Based on your description you might not even need your album table:

SELECT SUM(a.LicenseAmount)
, left(appl_musicUsedTrackCatNumber,6) as 'Album_code'
FROM db1.sync_license_apps a
inner join db1.sync_license_apps_music_used b 
on a.appl_ReferenceID = b.fk_appl_ReferenceID
group by left(appl_musicUsedTrackCatNumber,6)  

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If your album code is always 6 characters long this will group LicenseAmount from sync_license_apps by the album code taken from the column appl_musicUsedTrackCatNumber.
If you do want to add a table called Albums which joins on that album code, you're looking at something like this:

Select C.*
, s.licenseAmount
, s.Album_code
from (
SELECT SUM(a.LicenseAmount)
, left(appl_musicUsedTrackCatNumber,6) as 'Album_code'
FROM db1.sync_license_apps a
inner join db1.sync_license_apps_music_used b 
on a.appl_ReferenceID = b.fk_appl_ReferenceID
group by left(appl_musicUsedTrackCatNumber,6)
) as s
inner join db1.albums c
on s.album_code = c.album_code

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