It's normal behaviour, because after the first update it will be 2 same values for m2 and you don't want that since you have a unique constraint for that column. try this: CREATE TABLE master ( m1 INT primary key , m2 int unique ) ;
INSERT INTO master VALUES ( 1, 1 ) ; INSERT INTO master VALUES ( 2, 3) ; UPDATE master SET m2 = m2+1 ; ----- Original Message ----- From: Anoo Sivadasan Pillai To: Ardian Xharra Cc: pgsql-general@postgresql.org Sent: Tuesday, September 25, 2007 12:27 AM Subject: Re: [GENERAL] Why the ERROR: duplicate key violates unique constraint "master_pkey" is raised? - Is this a Bug? Hi, I am not using any sequences, The following batch can reproduce the behaviour. CREATE TABLE master ( m1 INT primary key , m2 int unique ) ; INSERT INTO master VALUES ( 1, 1 ) ; INSERT INTO master VALUES ( 2, 2) ; UPDATE master SET m2 = m2 + 1; With Cheers, Anoo S From: Ardian Xharra [mailto:[EMAIL PROTECTED] Sent: 25 September 2007 00:38 To: Anoo Sivadasan Pillai; pgsql-general@postgresql.org Cc: Anoo Sivadasan Pillai Subject: Re: [GENERAL] Why the ERROR: duplicate key violates unique constraint "master_pkey" is raised? - Is this a Bug? Probably you are using a sequence, and if so you need to update the value of sequence prior to update: SELECT setval('master_m1_seq',((SELECT id_m1 FROM master ORDER BY 1 DESC LIMIT 1)+1)); ----- Original Message ----- From: Anoo Sivadasan Pillai To: pgsql-general@postgresql.org Cc: Anoo Sivadasan Pillai Sent: Monday, September 24, 2007 3:20 AM Subject: [GENERAL] Why the ERROR: duplicate key violates unique constraint "master_pkey" is raised? - Is this a Bug? I am using "PostgreSQL 8.2.4 on i686-pc-mingw32, compiled by GCC gcc.exe (GCC) 3.4.2 (mingw-special)" on Windows 2003 server While I am trying to update a prmary key It is failing with the following message "ERROR: duplicate key violates unique constraint "master_pkey" " Can anybody explain why this happens so? Sending the script that I tried. CREATE TABLE master ( m1 INT primary key , m2 VARCHAR(100)) ; INSERT INTO master VALUES ( 1, 'm1' ) ; INSERT INTO master VALUES ( 2, 'm2' ) ; UPDATE master SET m1 = m1 + 1; Update fails with the message - ERROR: duplicate key violates unique constraint "master_pkey" If I insert data in the reverse order it is making no problem. Is this a Bug ? I tried , TRUNCATE TABLE master; INSERT INTO master VALUES ( 3, 'm3' ) ; INSERT INTO master VALUES ( 2, 'm2' ) ; UPDATE master SET m1 = m1 + 1; It works perfectly. Anoo S Visit our Website at www.rmesi.co.in This message is confidential. You should not copy it or disclose its contents to anyone. You may use and apply the information for the intended purpose only. Internet communications are not secure; therefore, RMESI does not accept legal responsibility for the contents of this message. Any views or opinions presented are those of the author only and not of RMESI. If this email has come to you in error, please delete it, along with any attachments. Please note that RMESI may intercept incoming and outgoing email communications. Freedom of Information Act 2000 This email and any attachments may contain confidential information belonging to RMESI. Where the email and any attachments do contain information of a confidential nature, including without limitation information relating to trade secrets, special terms or prices these shall be deemed for the purpose of the Freedom of Information Act 2000 as information provided in confidence by RMESI and the disclosure of which would be prejudicial to RMESI's commercial interests. This email has been scanned for viruses by Trend ScanMail. ------------------------------------------------------------------------------ No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.13.30/1030 - Release Date: 25/09/2007 08:02
