Question : Append Query/Macro Condition

I am using an Access 95 database.  In this database, I have two tables:  tblInput and tblOutput.  I wrote an append query to transfer the contents of tblInput to tblOutput.  Both tables have a field called DATE.  The dates in the DATE field on tblInput are all the same.  

I wrote a macro that runs the append query.  I would like to either write a condition on the macro or a module that will look at the date field on tblInput before the append query runs.  If one of the dates in tblInput is found in tblOutput, then a message box will appear saying, "Duplicate date found."  If a duplicate date is not found, then I would like the append query to run.

Answer : Append Query/Macro Condition

You could also try a query with an Outer Join condition that inserts only records where the Input date is not in the Output table.  Such as:

INSERT INTO tblOutput ( txtName, datDate )
SELECT tblInput.txtName, tblInput.datDate
FROM tblInput LEFT JOIN tblOutput ON tblInput.datDate = tblOutput.datDate
WHERE tblOutput.datDate Is Null;