Question

I’m trying to count the number of rows in this query, however it’s not working as expected, this returns an extra row, it should be 12, but it’s 13.

$numPhotos = mysql_num_rows(mysql_query("
SELECT albums.id 
FROM albums, albumData
WHERE 
(albumData.id=albums.albumID OR albums.albumID=0)
AND
albums.userID=$id
AND albums.state=0
AND albumData.state=0
"));

When I remove the OR statement part, and not count the rows with albumID=0, it returns 11. There is only one row where the albumID is 0, but it counts it as two?

$numPhotos = mysql_num_rows(mysql_query("
SELECT albums.id 
FROM albums, albumData
WHERE 
albumData.id=albums.albumID
AND
albums.userID=$id
AND albums.state=0
AND albumData.state=0
"));

Answer 1

Try to write query using JOIN:

SELECT albums.id FROM albums
LEFT JOIN albumData 
   ON albums.albumID=albumData.id
  AND albums.state=0
  AND albumData.state=0
WHERE albums.userID=$id

or

SELECT albums.id FROM albums
LEFT JOIN albumData 
   ON albums.albumID=albumData.id
WHERE albums.userID=$id
  AND albums.state=0
  AND albumData.state=0

Does this solve your trouble?

EDITED:
Try this

SELECT DISTINCT albums.id FROM albums
INNER JOIN albumData 
   ON (albums.albumID = albumData.id OR albums.albumID = 0)
  AND albums.state=0
  AND albumData.state=0
WHERE albums.userID=$id