Will substr + not function ignore null values ?

hi guys
i have a table test with 1 column named (value) of varchar2 type.
inside this table, i have 3 rows.
1) 2255
2) null
3) 5522
when i do select * from test where substr(value,1,1) not in ('3'), it only returns me
row 1) 2255
row 3) 5522
but why doesnt it return me row 2 with null value as well ?
since substr(null) will generate null. and null is also NOT IN ('3'), why doesnt it shows?
any ideas guys ?

Because NULL is unknown.
By definition you cannot say if unknown is IN or NOT IN anything.
So you have to account for the unknown however you think appropriate, in your case that would mean saying:
select * from test where substr(value,1,1) not in ('3') OR value IS NULL;
[pre]

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outputter.output(doc,out);
catch(IOException ioe){
System.out.println(ioe);
catch(SQLException sqle){

Can someone please help me with this problem
Thanks.

Will substr + not function ignore null values ?

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