Question about advanced SQL

Hi. I need some guidance for writing an effective query (instead of processing through PHP). I lets says I have two tables, tblCDs and tblOrders. tblCD cdID | cdTitle | cdArtist ------------------------------------------ 1 | Great Hits | Bon Jovi 2 | Forever Young | The Youngsters 3 | Now and Then | Beach Boys 4 | Cheesy Name | Two Tones tblOrders orderID | cdID_FK | ordererID ------------------------------------------ 1 | 1 | 442 2 | 3 | 233 3 | 1 | 233 Now, I want to select all the records from tblCD where the cdID does not appear in any row of tblOrders.cdID_FK This means that it selects all the CDs that have not been ordered. The results of the query should be cdID | cdTitle | cdArtist ------------------------------------------ 2 | Forever Young | The Youngsters 4 | Cheesy Name | Two Tones I know how I can do this in PHP (two queries - put all cdID_FK in an array, and on displaying the other query, check if it is in the array, and display if not) but there HAS to be an easier way. Adam.