Question

I have tried a bunch of different things but always get syntax errors.

I have two tables – tableA and tableB. They both have a con_number field as a unique ID. I want to select all of the rows in tableB that do not exist in tableA.

Can anyone please give me this query as it would be in MS Access?

I know that using NOT IN is quite inefficient in this case so if there is a better way then that would be great.

Thanks.

Answer 1

SELECT TableB.con_number FROM TableB WHERE NOT EXISTS (SELECT 1                    FROM TableA                    WHERE TableA.con_number = TableB.con_number);