Question

In my MySQL table, I have some rows with status = NULL and some with status = 0

When selecting them in a query:

SELECT *
FROM `table`
WHERE `status` != 0

This ignores both 0 and NULL values.

How can I ignore ONLY 0 values?

Answer 1

You can use the is null predicate:

if status is a numeric field:

SELECT *
FROM `table`
WHERE `status` != 0
OR `status` IS NULL

if status is a text field:

SELECT *
FROM `table`
WHERE `status` != '0'
OR `status` IS NULL

This works because NULL != 0 evaluates as NULL and NULL OR TRUE evaluates as TRUE. Rows whose inclusion condition evaluates to NULL are rejected.