[SQL] Helper aggregate function

[sergey kapustin]

Hello!
Can anyone tell me how i do this properly?

create or replace function agg(varchar,varchar) returns void as $func$
select $1,count(*) from $2 group by $1 order by $1;
$func$
Language SQL;

Right now this wives me "ERROR:  syntax error at or near "$2" at character
97
select $1,count(*) from $2 group by $1 order by $1;"

Thank you!

Re: [SQL] Helper aggregate function

[Robins Tharakan]

Please correct me if I am wrong, but as the last few lines of the first
section in the given document says, you can use $n only for values and not
for identifiers.

http://www.postgresql.org/docs/8.3/static/xfunc-sql.html

And one more thing, may be you would want to use a user-defined return type
instead of void for this function.

*Robins*

On Feb 3, 2008 5:14 PM, sergey kapustin <[EMAIL PROTECTED]> wrote:

> Hello!
> Can anyone tell me how i do this properly?
>
> create or replace function agg(varchar,varchar) returns void as $func$
> select $1,count(*) from $2 group by $1 order by $1;
> $func$
> Language SQL;
>
> Right now this wives me "ERROR:  syntax error at or near "$2" at character
> 97
> select $1,count(*) from $2 group by $1 order by $1;"
>
> Thank you!
>
>
>
>

Re: [SQL] Helper aggregate function

[Christian Kindler]

hi 

in this case you have to use execute:

>> select $1,count(*) from $2 group by $1 order by $1;
execute into myResultSet 'select ' || $1 || ' from ' || $2 || ' group by ' || 
$1 || ' order by  ' || $2; 

see plpgsql docs for detailed information

christian


On Sun, February 3, 2008 19:58, Robins Tharakan wrote:
> Please correct me if I am wrong, but as the last few lines of the first
> section in the given document says, you can use $n only for values and not
> for identifiers.
> 
> http://www.postgresql.org/docs/8.3/static/xfunc-sql.html
> 
> And one more thing, may be you would want to use a user-defined return
> type
> instead of void for this function.
> 
> *Robins*
> 
> On Feb 3, 2008 5:14 PM, sergey kapustin <[EMAIL PROTECTED]> wrote:
> 
>> Hello!
>> Can anyone tell me how i do this properly?
>>
>> create or replace function agg(varchar,varchar) returns void as $func$
>> select $1,count(*) from $2 group by $1 order by $1;
>> $func$
>> Language SQL;
>>
>> Right now this wives me "ERROR:  syntax error at or near "$2" at
>> character
>> 97
>> select $1,count(*) from $2 group by $1 order by $1;"
>>
>> Thank you!
>>
>>
>>
>>
> 


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