this sql statment
`
SELECT zp_images.id, zp_images.filename, zp_images.title, zp_albums.id, zp_albums.title, zp_tags.name
FROM zp_images, zp_albums, zp_obj_to_tag, zp_tags
WHERE (zp_images.albumid=zp_albums.id)and(zp_images.id=zp_obj_to_tag.objectid)and(zp_obj_to_tag.tagid=zp_tags.id)and(zp_tags.name='Portfolio')
`
give 30 pictures, on my web site
and gives 20 pictures, on my backup site
how verify if the db of my prod site is corrupted ?