Обсуждение: Auto incrementing an integer

How do I construct a datatype that autoincrement in postgreSQL?

Thanks
Sylte

Quoting Sylte <Sylte_@hotmail.com>:

> How do I construct a datatype that autoincrement in postgreSQL?

See sequences and the SERIAL type. 

Saludos... :-)

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Take a look at the SERIAL datatype as well as sequences (CREATE SEQUENCE,
NEXTVAL, CURRVAL).

good luck!

On Mon, 14 May 2001, Sylte wrote:

> How do I construct a datatype that autoincrement in postgreSQL?
>
> Thanks
> Sylte
>
>
>
>
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Try the serial data type or add "DEFAULT nextval('Invoice_s')" to the 
column definition where Invoice_s is the name of a sequence that you have 
created.

Hope this helps, Michael

-----Original Message-----
From:    Sylte [SMTP:Sylte_@hotmail.com]
Sent:    Monday, May 14, 2001 7:02 AM
To:    pgsql-sql@postgresql.org
Subject:    Auto incrementing an integer

How do I construct a datatype that autoincrement in postgreSQL?

Thanks
Sylte




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is there any function from which i can get system time?

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select now();

???

+ Justin

Seema Noor wrote:
> 
> is there any function from which i can get system time?
> 
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-- 
"My grandfather once told me that there are two kinds of people: those
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first group; there was less competition there."    - Indira Gandhi

Try using:

SELECT now()

It should do what you want.  If not there are a whole
pile of date functions.  Look them up in the Users
Guide.

Hope this is helpful.
Jason

--- Seema Noor <seema_56@yahoo.com> wrote:
> is there any function from which i can get system
> time?
> 
>
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Sylte wrote:

>How do I construct a datatype that autoincrement in postgreSQL?
>
Use the SERIAL data type instead of an INT4.    Serial is an integer 
(INT4) that's default value is base on a sequence.

for example...

create table foo (  my_id serial not null,  my_data text
);

Thanks Mart�n....I found this http://dis.lib.muohio.edu/code/entry.html?ID=3

Creating an Autoincrement field in Postgresql
 postgres does this a little differently; the "serial" type creates an
integer column, and a sequence used to increment this column.

try this:

create table table_name(control serial,another_column text,primary key(control)
);

results in this:
Table    = table_name
+----------------------------------+----------------------------------+-----
--+
|              Field               |              Type                |
Length|
+----------------------------------+----------------------------------+-----
--+
| control                          | int4 not null default nextval('" |
4 |
| another_column                   | text                             |
var |
+----------------------------------+----------------------------------+-----
--+
Index:    table_name_pkey