Try:
SELECT * FROM t1 WHERE b IS NULL;
A column value is null or not null; it cannot be said to equal null as null
has no value;
rayB
|---------+------------------------------->
| | Stefan Finzel |
| | <[EMAIL PROTECTED]|
| | -Online.de> |
| | |
| | 23/03/2005 04:20 |
| | Please respond to |
| | sqlite-users |
| | |
|---------+------------------------------->
>--------------------------------------------------------------------------------------------------------------|
|
|
| To: sqlite-users@sqlite.org
|
| cc:
|
| Subject: - [sqlite] How to do NULL Handling in SELECT Statement?
|
>--------------------------------------------------------------------------------------------------------------|
Hi,
what is the correct way to query for NULL-values? I use SQLite version
3.2.0
create table t1(a int, b char);
insert into t1 values(1, '2');
insert into t1 values(3,NULL);
insert into t1 values(NULL,'4');
select * from t1 where b=NULL;
-- this gives no result at all
select * from t1 where b='';
-- this also gives no result
select * from t1 where b<>'';
-- this gives the expected result (but i wanted the reverse data set)
1|2
|4
-- so i tried
select * from t1 where not b<>'';
-- and still i get not the result i was looking for.
TIA
Stefan
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