DECLARE @SETNAME Varchar(40) DECLARE @SSKey varchar(16) DECLARE @SETKey VARCHAR(16) SET @Setname SET @SETKEY = (SELECT Taxon_Designation_Set_Key FROM Taxon_Designation_Set WHERE Title = @Setname) SET @SSKey = (SELECT Taxon_Designation_Set_Key FROM Taxon_Designation_Set WHERE Title = @Setname AND System_supplied_data = 1) IF @SETKEY is null or @SSKey IS not NULL RAISERROR ('The set either does not exist in the database or is a system supplied one (and therefore cannot be deleted).', 10, 1) ELSE BEGIN DELETE FROM Taxon_Designation_set_Item WHERE Taxon_Designation_Set_Key = @SetKey DELETE FROM Taxon_DESIGNATION_SET where Taxon_Designation_Set_Key = @SetKey End