From: Chris Travers <chris@travelamericas.com>
To: Michael Glaesemann <grzm@myrealbox.com>
Cc: Vikas J <vikas.jadhav@codecindia.com>
Cc: postgresql sql list <pgsql-sql@postgresql.org>
Subject: Re: Problem -Postgre sql
Date: Tue, 18 Oct 2005 23:03:05 -0700
Message-ID: <4355E199.2040904@travelamericas.com> (raw)
In-Reply-To: <8FB39706-1EFC-4D9F-ADBD-1311D4B08940@myrealbox.com>
References: <000c01c5ce34$61797c20$6f0aa8c0@codecindia.com>
<E80C316D-C8FB-457A-8032-ABF6A4A36AB0@myrealbox.com>
<00b101c5d46e$3cd6fa60$6f0aa8c0@codecindia.com>
<8FB39706-1EFC-4D9F-ADBD-1311D4B08940@myrealbox.com>
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
>
>
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To: pgsql-sql@postgresql.org
Cc: chris@travelamericas.com, grzm@myrealbox.com, vikas.jadhav@codecindia.com
Subject: Re: Problem -Postgre sql
In-Reply-To: <4355E199.2040904@travelamericas.com>
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