NULL values in where clause

Question

i\'ve got a table \"bla\" like this:

[id]    [name]    [fk]
1       test      4
2       foo       5
3       bar       NULL

if i do the sql

Answer 1

How about

SELECT * FROM bla WHERE NOT (fk = 4)

Logic:

NULL = 4 --false
5 = 4    --false
4 = 4    --true

NOT (NULL = 4) --true
NOT (5 = 4)    --true
NOT (4 = 4)    --false