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Thread: Fetching a single column from a record returning function

Fetching a single column from a record returning function

From
"Kumar"
Date:
Hi Friends,
 
Postgres 7.3.4 on RH Linux 7.2
 
I am using a record variable inside a functions and fetch the result via the follow command
 
select * from .fn_email(1)
as (email_folder_id int4,email_folder_name varchar,descrip varchar,msgcount int8,unreadcount int8,size int8);
 
 
Is it possible to fetch only one column (the 'msgcount') from the function. Because I am interested in SUM(msgcount).  Please shed some light.
 
Regards
kumar

Re: Fetching a single column from a record returning function

From
Tom Lane
Date:
"Kumar" <sgnerd@yahoo.com.sg> writes:
> select * from fn_email(1)
> as (email_folder_id int4,email_folder_name varchar,descrip varchar,msgcount
>  int8,unreadcount int8,size int8);

> Is it possible to fetch only one column (the 'msgcount') from the function.=
>  Because I am interested in SUM(msgcount).  Please shed some light.

select sum(msgcount) from fn_email(1)
as (email_folder_id int4,email_folder_name varchar,descrip varchar,msgcountint8,unreadcount int8,size int8);
        regards, tom lane

Re: Fetching a single column from a record returning function

From
Joe Conway
Date:
Kumar wrote:
> select * from .fn_email(1) as (email_folder_id int4,email_folder_name
> varchar,descrip varchar,msgcount int8,unreadcount int8,size int8);
> 
> Is it possible to fetch only one column (the 'msgcount') from the
> function. Because I am interested in SUM(msgcount).  Please shed some
> light.


What's wrong with:

select msgcount from fn_email(1)
as (email_folder_id int4,email_folder_name varchar,descrip 
varchar,msgcount int8,unreadcount int8,size int8);

?

Try showing us more detail about what you want to do and why it isn't 
currently working.

Joe

Re: Fetching a single column from a record returning function

From
"Kumar"
Date:
Yes it worked. Thanks

----- Original Message ----- 
From: "Tom Lane" <tgl@sss.pgh.pa.us>
To: "Kumar" <sgnerd@yahoo.com.sg>
Cc: "psql" <pgsql-sql@postgresql.org>
Sent: Tuesday, January 20, 2004 9:28 PM
Subject: Re: [SQL] Fetching a single column from a record returning function


> "Kumar" <sgnerd@yahoo.com.sg> writes:
> > select * from fn_email(1)
> > as (email_folder_id int4,email_folder_name varchar,descrip
varchar,msgcount
> >  int8,unreadcount int8,size int8);
>
> > Is it possible to fetch only one column (the 'msgcount') from the
function.=
> >  Because I am interested in SUM(msgcount).  Please shed some light.
>
> select sum(msgcount) from fn_email(1)
> as (email_folder_id int4,email_folder_name varchar,descrip
varchar,msgcount
>  int8,unreadcount int8,size int8);
>
> regards, tom lane
>
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