Question

I’ve got a simple DB query. Basically I want to select all rows that are NOT equal to a certain set of strings, or is empty (if it’s empty I do NOT want it to be selected).

This is what I’ve got:

select * from tbl_user where secretCode != ('S00' OR 'S05' OR 'A10' OR '')

The datatype of secretcode is CHAR(4), NULL (NO), DEFAULT NONE

What am I doing wrong here, should I be using NULL instead of '' ?

Thanks.

Answer 1

I think your query should be like this:

select * from tbl_user where secretCode NOT IN ('S00', 'S05', 'A10', '') AND
secretCode IS NOT NULL