Pass In “WHERE” parameters to PostgreSQL View?

Question

I have a rather complicated query on my PostgreSQL database spanning 4 tables via a series of nested subqueries. However, despite the slightly tricky looking appearance and

Answer 1

In most cases the set-returning function is the way to go, but in the event that you want to both read and write to the set, a view may be more appropriate. And it is possible for a view to read a session parameter:

CREATE VIEW widget_sb AS SELECT * FROM widget WHERE column = cast(current_setting('mydomain.myparam') as int)

SET mydomain.myparam = 0
select * from widget_sb
[results]

SET mydomain.myparam = 1
select * from widget_sb
[distinct results]