I don't think your numbers are quite right on the query. He is checking AND delivery.Data=ddts.Data which will limit the data to just records that are 'linked' between the tables by there data field. Of course i don't know how valid that link is, but unless every record in both tables has the same data feild he should be okay. (Ignoring of course the comparison of `User`=\"@user\", i have no idea what thats suppose to do.