Re: [BUGS] BUG #2975: UNIQUE INDEX doesn't work
On Wed, Feb 14, 2007 at 10:01:58AM +0100, Steven Lambert wrote: > You are right, the index has more columns and one of them have most of the > time the value NULL. > It is the date when the record has been "deleted" See "Unique Constraints" in the documentation, in particular the last paragraph: http://www.postgresql.org/docs/8.1/interactive/ddl-constraints.html#AEN2016 "However, null values are not considered equal in this comparison. That means even in the presence of a unique constraint it is possible to store duplicate rows that contain a null value in at least one of the constrained columns." This has been discussed before; search the archives for words like "null", "unique", and "comparison" or "compare". -- Michael Fuhr ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
Re: [BUGS] BUG #2975: UNIQUE INDEX doesn't work
On Thu, Feb 08, 2007 at 11:57:19AM -0500, Bruce Momjian wrote: > Steven wrote: > > I have a unique index on a table, but it is still possible to insert a > > duplicated row, without any message what so ever. > > Please show us a self-contained example. Are you perchance inserting NULL into the column(s) with the unique index? -- Michael Fuhr ---(end of broadcast)--- TIP 1: if posting/reading through Usenet, please send an appropriate subscribe-nomail command to [EMAIL PROTECTED] so that your message can get through to the mailing list cleanly
Re: [BUGS] BUG #2975: UNIQUE INDEX doesn't work
Steven wrote: > > The following bug has been logged online: > > Bug reference: 2975 > Logged by: Steven > Email address: [EMAIL PROTECTED] > PostgreSQL version: 8.1.4 > Operating system: Windows Xp Sp2 > Description:UNIQUE INDEX doesn't work > Details: > > I have a unique index on a table, but it is still possible to insert a > duplicated row, without any message what so ever. Please show us a self-contained example. -- Bruce Momjian <[EMAIL PROTECTED]> http://momjian.us EnterpriseDB http://www.enterprisedb.com + If your life is a hard drive, Christ can be your backup. + ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
[BUGS] BUG #2975: UNIQUE INDEX doesn't work
The following bug has been logged online: Bug reference: 2975 Logged by: Steven Email address: [EMAIL PROTECTED] PostgreSQL version: 8.1.4 Operating system: Windows Xp Sp2 Description:UNIQUE INDEX doesn't work Details: I have a unique index on a table, but it is still possible to insert a duplicated row, without any message what so ever. ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
