Re: [SQL] max (timestamp,timestamp)

[T E Schmitz]

Michael Fuhr wrote:

On Mon, Nov 13, 2006 at 07:29:09PM +0500, imad wrote:


max (timestamptz, timestamptz) does not exist already. You need to
create a simple function in PLpgSQL something like

if a > b
return a;
else
return b;



Since PostgreSQL 8.1 you can use GREATEST:

test=> SELECT greatest(1, 2);


That'll be a handy feature! Unfortunately, my server is still on 7.4.


Thanks to everyone for the quick responses.
--


Regards,

Tarlika

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Re: [SQL] max (timestamp,timestamp)

[Michael Fuhr]

On Mon, Nov 13, 2006 at 07:29:09PM +0500, imad wrote:
> max (timestamptz, timestamptz) does not exist already. You need to
> create a simple function in PLpgSQL something like
> 
> if a > b
> return a;
> else
> return b;

Since PostgreSQL 8.1 you can use GREATEST:

test=> SELECT greatest(1, 2);
 greatest 
--
2
(1 row)

test=> SELECT greatest(2, 1);
 greatest 
--
2
(1 row)

test=> SELECT greatest(6, 3, 1, 10, 9, 5, 2, 7, 8, 4);
 greatest 
--
   10
(1 row)

-- 
Michael Fuhr

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Re: [SQL] max (timestamp,timestamp)

[imad]

max (timestamptz, timestamptz) does not exist already. You need to
create a simple function in PLpgSQL something like

if a > b
return a;
else
return b;

Even an sql function will do the job here using case statement.

--Imad
www.EntepriseDB.com



On 11/13/06, A. Kretschmer <[EMAIL PROTECTED]> wrote:

am  Mon, dem 13.11.2006, um 13:46:00 + mailte T E Schmitz folgendes:
> I tried the following query but the query fails as
> "function max (timestamp w. timezone,timestamp w. timezone) does not exist"
>
> SELECT id,
>
> MAX(last_updated,
> (SELECT MAX (last_updated) FROM  product_category_member WHERE
> product_category_member.id =  product_category.id))
>
> FROM product_category
>
>
> product_category.last_updated and product_category_member.last_updated
> are timestamps with timezone.

Really, there are no such function. Perhaps this can help you:

SELECT id, MAX(product_category.last_updated),
MAX(product_category_member.last_updated) from product_category,
product_category_member WHERE product_category_member.id =
product_category.id;

**untested**



Your fault is that there are no max(timestamp,timestamp) - funktion and
i think, you should read more about JOINs.


Andreas
--
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47215,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net

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Re: [SQL] max (timestamp,timestamp)

[A. Kretschmer]

am  Mon, dem 13.11.2006, um 13:46:00 + mailte T E Schmitz folgendes:
> I tried the following query but the query fails as
> "function max (timestamp w. timezone,timestamp w. timezone) does not exist"
> 
> SELECT id,
> 
> MAX(last_updated,
> (SELECT MAX (last_updated) FROM  product_category_member WHERE
> product_category_member.id =  product_category.id))
> 
> FROM product_category
> 
> 
> product_category.last_updated and product_category_member.last_updated
> are timestamps with timezone.

Really, there are no such function. Perhaps this can help you:

SELECT id, MAX(product_category.last_updated),
MAX(product_category_member.last_updated) from product_category,
product_category_member WHERE product_category_member.id =
product_category.id;

**untested**



Your fault is that there are no max(timestamp,timestamp) - funktion and
i think, you should read more about JOINs.


Andreas
-- 
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47215,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net

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