I have three tablestblPatienttblMINAPtblBCISI have set up an indeterminate relationship between tblPatient and tblMINAP using NHSNumber, and done the same with tblBCIS.My problem is thistblMINAP is a complete dataset for the financial 2010/11tblBCIS only has April 2010 to January 2010.How do I find out which records in tblBCIS are 'missing'The answer is on the tip of my brain....