MS Access - WHERE IN works, but WHERE NOT IN fails

Question

I have the following query (simplified) on MS Access:

SELECT * FROM table1 WHERE table1.ID NOT IN (SELECT DISTINCT table1id FROM table2);

M

Answer 1

Generally, the problem with IN and NOT in has to do with NULLs in the subselect. Try this and see if it works:

SELECT *
FROM table1
WHERE table1.ID NOT IN (SELECT DISTINCT table1id FROM table2 where tableid is not null);