Re: Why the ERROR: duplicate key violates unique constraint "master_pkey" is raised? - Is this a Bug? - Mailing list pgsql-general

Hi Ashish,

Do you mean to say that UPDATE command will work depending on the order in which data is inserted?

I mean,

The following command will not work

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;

But the following command will work

CREATE TABLE master ( m1 INT primary key , m2 VARCHAR(100)) ;

INSERT  INTO master VALUES  ( 2, 'm2' ) ;

INSERT  INTO master VALUES  ( 1, 'm1' ) ;

UPDATE  master SET m1 = m1 + 1;

Even though both are inserting same data ?

----- Original Message -----

From: Anoo Sivadasan Pillai

To: pgsql-general@postgresql.org

Cc: Anoo Sivadasan Pillai

Sent: Monday, September 24, 2007 12:50 PM

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

 

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