Thread: 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
On Apr 20, 2011, at 9:15 PM, Emi Lu wrote: > 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 Following is a link of deepsz which has a way of implementation of rownum. http://www.depesz.com/index.php/2007/08/17/rownum-anyone-cumulative-sum-in-one-query/ Thanks & Regards, Vibhor Kumar EnterpriseDB Corporation The Enterprise PostgreSQL Company vibhor.kumar@enterprisedb.com Blog:http://vibhork.blogspot.com
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
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
Emi Lu <emilu@encs.concordia.ca> wrote:
> 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.
Not really... you have to reset the sequence after the select, and i'm
not sure about ordering the result.
Andreas
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