Обсуждение: BUG #4021: UUID NULL and not equal query failed
The following bug has been logged online: Bug reference: 4021 Logged by: Yann ROBIN Email address: yann.robin@withart.fr PostgreSQL version: 8.3.0 build 140 Operating system: Windows XP SP2 Description: UUID NULL and not equal query failed Details: Hi, I've tried to do a not like query on a UUID field and the row that i'd like to get has a NULL value for the UUID field, it gives me no result. The request : SELECT * FROM t_account WHERE Update_Timestamp > '2008-03-09 12:35:10.309000' AND Update_Timestamp <= '2008-03-09 12:35:37.861000' AND Update_Id != '48012851-3aa4-9940-9ab4-b8333da6b45b' 0 result. The same request without the Update_Id condition : SELECT * FROM t_account WHERE Update_Timestamp > '2008-03-09 12:35:10.309000' AND Update_Timestamp <= '2008-03-09 12:35:37.861000' 1 result. The Update_Id field is null. The same request but with a OR IS NULL condition : SELECT * FROM t_account WHERE Update_Timestamp > '2008-03-09 12:35:10.309000' AND Update_Timestamp <= '2008-03-09 12:35:37.861000' AND (Update_Id != '48012851-3aa4-9940-9ab4-b8333da6b45b' OR Update_Id IS NULL) 1 result. So my conclusion is that the NOT EQUAL operator doesn't match how it should the NULL value field. Is it a bug or a wanted behavior ? -- Yann
Yann ROBIN wrote: > So my conclusion is that the NOT EQUAL operator doesn't match how it should > the NULL value field. > Is it a bug or a wanted behavior ? It's normal behavior, required by SQL standard, and not specific to UUIDs. See also http://www.postgresql.org/docs/8.3/interactive/functions-comparison.html. -- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com
Thank you, you're right and I should have none ! -----Message d'origine----- De=A0: pgsql-bugs-owner@postgresql.org [mailto:pgsql-bugs-owner@postgresql.org] De la part de Heikki Linnakangas Envoy=E9=A0: dimanche 9 mars 2008 15:24 =C0=A0: Yann ROBIN Cc=A0: pgsql-bugs@postgresql.org Objet=A0: Re: [BUGS] BUG #4021: UUID NULL and not equal query failed Yann ROBIN wrote: > So my conclusion is that the NOT EQUAL operator doesn't match how it should > the NULL value field. > Is it a bug or a wanted behavior ? It's normal behavior, required by SQL standard, and not specific to=20 UUIDs. See also=20 http://www.postgresql.org/docs/8.3/interactive/functions-comparison.html. --=20 Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com --=20 Sent via pgsql-bugs mailing list (pgsql-bugs@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-bugs