Re: Recursive function that receives a list of IDs and returns all child IDs

thanks a lot!
that function does it exactly as wished ;)!


Am 23.03.2011 22:46, schrieb Merlin Moncure:
> On Wed, Mar 23, 2011 at 10:29 AM, Sven Haag<sven-haag@gmx.de>  wrote:
>> hello pgsql fans out there,
>>
>> i've already created a function that returns a list of IDs of all sub-samples based on a given sample ID. this works
fine.now i like to extend this function so that it can receive a list of sample IDs. e.g.: 
>>
>> fn_get_subsamples(IN sample_numbers SETOF integer)
>>
>>
>> here is the existing function:
>>
>> CREATE OR REPLACE FUNCTION fn_get_subsamples(IN sample_number integer)
>>   RETURNS SETOF integer AS
>> $BODY$
>>         WITH RECURSIVE recursetree(sample_number) AS (
>>           SELECT sample_number
>>           FROM sample
>>           WHERE parent_sample = $1
>>
>>           UNION ALL
>>
>>           SELECT t.sample_number
>>           FROM sample t
>>           JOIN recursetree rt ON rt.sample_number = t.parent_sample
>>         )
>>
>>         SELECT sample_number
>>         FROM recursetree;
>> $BODY$
>>   LANGUAGE sql VOLATILE
>
> CREATE OR REPLACE FUNCTION fn_get_subsamples(IN sample_numbers integer[])
>   RETURNS SETOF integer AS
> $BODY$
>         WITH RECURSIVE recursetree(sample_number) AS (
>           SELECT sample_number
>           FROM sample
>           WHERE parent_sample in (select unnest($1))
>
>           UNION ALL
>
>           SELECT t.sample_number
>           FROM sample t
>           JOIN recursetree rt ON rt.sample_number = t.parent_sample
>         )
>
>         SELECT sample_number
>         FROM recursetree;
> $BODY$
>   LANGUAGE sql VOLATILE
>
> merlin
>