Message-ID: <4DC016D4.9090608@encs.concordia.ca>
Date: Tue, 03 May 2011 10:53:08 -0400
From: Emi Lu <emilu@encs.concordia.ca>
Reply-To: emilu@encs.concordia.ca
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To: pgsql-sql@postgresql.org
CC: "Oliveiros d'Azevedo Cristina" <oliveiros.cristina@marktest.pt>
Subject: Re: How to realize ROW_NUMBER() in 8.3?
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	<0E2AEE255CB846CAA0017E7BB54D501C@marktestcr.marktest.pt>
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Thank you for the info.

I found a simple way:
==========================
[1] create SEQUENCE tmp start 7820;
[2]
     insert into desti_table_name
     select nextval('tmp'),
            c1, c2... ... cN
     from t1 left join t2... ... tn
     where ... ...

Just for people using 8.3, this is mimic row_number.

Emi


> If your table is not terribly big, you can
> try something like
>
> SELECT a.col1,a.col2, COUNT(*) as row_number
> FROM yourTable a,yourTable b
> WHERE a.col1 >= b.col1 -- I'm assuming col1 is primary key
> GROUP BY a.col1,a.col2
> ORDER BY row_number
>
> This is pure SQL, should work in every version...
>
> Best,
> Oliveiros
>
> ----- Original Message ----- From: "Emi Lu" <emilu@encs.concordia.ca>
> To: <pgsql-sql@postgresql.org>
> Sent: Wednesday, April 20, 2011 4:45 PM
> Subject: [SQL] How to realize ROW_NUMBER() in 8.3?
>
>
>> Hello,
>>
>> ROW_NUMBER() is only ready in 8.4. For 8.3, is there a simple way to
>> get row_number
>>
>> select row_number(), col1, col2...
>> FROM tableName
>>
>> Thanks a lot!
>>
>> Ding Ye
>>
>> --
>> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
>> To make changes to your subscription:
>> http://www.postgresql.org/mailpref/pgsql-sql
>


-- 
Emi Lu, ENCS, Concordia University, Montreal H3G 1M8
emilu@encs.concordia.ca        +1 514 848-2424 x5884