On Wed, Nov 28, 2007 at 10:37:29PM -0700, m h wrote:
On Nov 26, 2007 4:47 PM, m h sesquile@gmail.com wrote:
My understanding that is that NULL is never equal to anything including itself. Thus to test for NULL values, one must use the IS operator. I'm wondering if the following is a bug. The NOT IN will return the null row, instead of the empty set. Are NULL values outside that query?
CREATE TABLE query_users ( user_id INT NOT NULL AUTO_INCREMENT, user_name VARCHAR(20), PRIMARY KEY (user_id) );
INSERT INTO query_users (user_id, user_name) VALUES (1, 'matt');
INSERT INTO query_users (user_id, user_name) VALUES (2, 'fred');
INSERT INTO query_users (user_id, user_name) VALUES (3, null);
SELECT user_name FROM query_users WHERE user_name IN ('matt', 'fred');
-- should return empty set, returns null SELECT user_name FROM query_users WHERE user_name NOT IN ('matt', 'fred');
Should I file a bug (or feature request) for this?
I just checked in a fix, ie not needed.
Niels
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