I had considered that, but the problem is that the img_id's are sequential in the database -- not the album. In other words, if I wanted img_id #43, I could not just say "give me img_id #42, #43 and #44" - because #42 and #44 could possibly belong to another album_id for the same user - or another album_id for a completely different user.

Here is an example of the table: 

img_id | album_id | uid |     name     | ext  
-------+----------+-----+--------------+------
    38 |      14  |  89 | mypetrat     | jpg  
    39 |      14  |  89 | mypetlemur   | jpg  
    40 |       2  |  12 | vacation_01  | jpg  
    41 |      14  |  89 | mypetvulture | jpg  
    42 |       2  |  12 | vacation_02  | jpg  
    43 |       2  |  12 | vacation_03  | jpg  
    44 |      14  |  89 | mypetcow     | jpg

[download]

In reply to Re^2: Building an index for next/last in a photo album. by Seumas
in thread Building an index for next/last in a photo album. by Seumas

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