From: | Chris Travers <chris(at)travelamericas(dot)com> |
---|---|
To: | Michael Glaesemann <grzm(at)myrealbox(dot)com> |
Cc: | Vikas J <vikas(dot)jadhav(at)codecindia(dot)com>, postgresql sql list <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Problem -Postgre sql |
Date: | 2005-10-19 06:03:05 |
Message-ID: | 4355E199.2040904@travelamericas.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
Correct me if I am wrong, but isn't COALESCE standard in this way?
Best Wishes,
Chris Travers
Metatron Technology Consulting
Michael Glaesemann wrote:
> [Please do not email me directly. Please post to the list so others
> may help and benefit from the discussion.]
>
> On Oct 19, 2005, at 14:30 , Vikas J wrote:
>
>> IsNull in sql server has syntax like isnull(column,substitute)
>> if "column" is null it shows value of "substitute". That can be
>> achieved
>> with CASE clause in postrgre but I want alternate function.
>
>
> If you look at the doc links I provided below, you will find that
> COALESCE does exactly this.
>
>> Can you tell me how to write function like MAX() that will work
>> directly on
>> colmuns. I want to create my own function that will not need table
>> name as
>> paramter.
>> it shld work similarly to max() function in postgre.
>
>
> [Again, it's PostgreSQL or Postgres. It is *not* spelled "postgre".]
>
> In my experience, the max() aggregate function does not require table
> names as parameters and work on columns directly.
> http://www.postgresql.org/docs/8.0/interactive/functions-aggregate.html
>
> I suggest you take some time to look at the docs. They're quite
> extensive and helpful.
> http://www.postgresql.org/docs/8.0/interactive/index.html
>
>
> Michael Glaesemann
> grzm myrealbox com
>
>
>>> I'm not quite sure what the ISNULL() function does in SQL Server, but
>>> it sounds like it might be similar to either COALESCE or the IS NULL
>>> expression.
>>>
>>> These pages might help you:
>>>
>>> COALESCE
>>> http://www.postgresql.org/docs/8.0/interactive/functions-
>>> conditional.html#AEN12056
>>>
>>> IS NULL
>>> http://www.postgresql.org/docs/8.0/interactive/functions-
>>> comparison.html
>>
>
>
> ---------------------------(end of broadcast)---------------------------
> TIP 4: Have you searched our list archives?
>
> http://archives.postgresql.org
>
>
From | Date | Subject | |
---|---|---|---|
Next Message | Richard Huxton | 2005-10-19 07:25:49 | Re: Double query (limit and offset) |
Previous Message | Matthew Peter | 2005-10-19 05:54:23 | Re: problems with array |