Question

Example I have the following records on column_name “color”: blue, red, green, null…
when I do a select query .. select * from table_name where color <> red…
The sql should return all records except those that have color red, right? Why is it not showing those value that have null as color? Thank you!

Answer 1

In general, any comparison with NULL returns false. If you want to also get NULL rows, you’ll have to explicitly ask for them:

color <> 'red' OR color IS NULL