Re: Auto-Increment in Postgres

["David Johnston" <polobo@xxxxxxxxx>]

“But this adds the column at the end…” – column order in the table definition is unreliable; when you output you should specify the column order yourself.

 

As to populating within a sequence that has missing values that is more trouble than it is worth.

 

If you want to add a column and make it the primary key you need to indicate such in your ALTER TABLE statement by adding “PRIMARY KEY” to the end of it: “ALTER TABLE t ADD COLUMN c serial PRIMARY KEY”

 

If you really feel you need to do as you explain I would advise giving more context as to what and why you are doing that so alternative solutions can be presented.

 

David J

 

From: pgsql-general-owner@xxxxxxxxxxxxxx [mailto:pgsql-general-owner@xxxxxxxxxxxxxx] On Behalf Of Adarsh Sharma
Sent: Friday, February 11, 2011 6:14 AM
To: pgsql-general@xxxxxxxxxxxxxx
Subject: Auto-Increment in Postgres

 

Dear all,


I have an Integer column in Postgres database table. Let's say the column has below values :


1
2
3
4
5
6
7
8
9
10


Now if i deleted some rows where id= 3 ,5 and 8  or it have these type of data then

The data look like as :

1
2
4
6
7
9
10

I want to have it id's as
1
2
3
4
5
6
7
and next data is inserted right at 8 .

I follow these steps

alter table meta_test drop column metadataid;

alter table meta_test add metadataid serial;

But this adds the column at the end but i want to it as primary key.

Please help how to achieve it.


Thanks & best Regards
Adarsh Sharma