[sqlite] SELECT on empty fields ??

[Daniel Schumann]

Hello,

i got a table 't' with two fields for example :

Lastname   |   Name
---------------------------------
Duck          |  Donald
                  |  Peter

with :

SELECT * FROM t WHERE (Lastname='Duck') AND (Name='Donald')

everything is all right
with :

SELECT * FROM t WHERE (Lastname='') AND (Name='Peter')
or
SELECT * FROM t WHERE (Lastname=NULL) AND (Name='Peter')

nothing is selected

what do i wrong ?
thx