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From: Louis-David Mitterrand <vindex+lists-pgsql-sql@apartia.org>
To: pgsql-sql@postgresql.org
Subject: passing a multiple join to a function?
Date: Mon, 17 Dec 2007 14:06:29 +0100
Message-ID: <20071217130629.GA8338@apartia.fr> (raw)

Hi,

I've got this ugly case statement that I'd like to hide in a function:

	select
	...
	case when
		d.start_date <= CURRENT_DATE and
		case when w.show_type in ('cinéma','livre')
		then d.start_date >= CURRENT_DATE - 21
		else (d.end_date >= CURRENT_DATE or d.end_date is null) end
	then '0_actualite'
	when
		d.start_date > CURRENT_DATE
	then '1_agenda'
	else '2_archive'
	end
	as timing
	...
	from story s
    join show w on (s.id_show = w.id_show)
    join show_date d on (d.id_show = w.id_show and
         d.start_date = (select d2.start_date from show_date d2                              where d2.id_show = w.id_show                                                    order by d2.end_date >= CURRENT_DATE desc,
             d2.start_date limit 1)
    )
	...	

I could very well create a show_timing(int) function that accepts an 
id_show and performs its own, additional, multiple join complex query on 
story, show_date, and show.

Is there a way of feeding enough data to the function to avoid another 
query?

Thanks,



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