Access query to retrieve all three fields not equal

Question

I need to write a query in MS Access where all the three columns should not be equal .

For example there are three columns ABC . Each column should not be equal to each other all should have a separate value.

How can I write such a query?

Answer 1

SELECT a, b, c
FROM   my_table
WHERE  a<>b AND a<>c AND b<>c

Answer 2

If your fields are non-nullable, all you need to check is that A != B, A != C, and B != C:

SELECT *
FROM test
WHERE A <> B AND A <> C AND B <> C

The same query would be OK if fields are nullable, but NULL s are not considered a valid value.