Re-use a hardcoded value in multiple function calls in PostgreSQL query -



Re-use a hardcoded value in multiple function calls in PostgreSQL query -

i have functions in postgresql 9.0 homecoming table results. thought behind these homecoming info @ time, eg.

create function person_asof(effective_time timestamp time zone) returns setof person ... create function pgroup_asof(effective_time timestamp time zone) returns setof pgroup ...

i can query them if tables, joins , all:

select * pgroup_asof('2011-01-01') g bring together person_asof('2011-01-01') p on g.id = p.group_id

this works fine, there trick can utilize specify effective time once?

i tried this:

select * (select '2010-04-12'::timestamp ts) effective, pgroup_asof(effective.ts) g bring together person_asof(effective.ts) p on g.id = p.group_id

...but fails error: function look in cannot refer other relations of same query level , putting main query sub-query doesn't help, either.

this have wanted in past not possible yet, there may hope on horizon.

postgresql sql-function

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