Re: SQL Date Challenge

Since so many people responded to my initial question, I thought I'd
post my procedural solution using PL/pgSQL (permission granted to
Roberto to acquire it).  

I'm not gonna even try to explain the various references to my database
structure; there are too many.  This is all from StaffOS, which may soon
be an Open-Source project near you:

CREATE FUNCTION if_create_timecards_due ()
RETURNS BOOLEAN AS '
DECLAREtc_period VARCHAR;tc_length INTERVAL;check_date DATE;first_date DATE;tc_window INTERVAL;first_week DATE;week_ends INT4;wday_diff INT4;

BEGINtc_window := fn_get_admin_value(''timecard window'');tc_period := fn_get_admin_value(''timecard period'');week_ends := to_number(fn_get_admin_value(''week ends''),''9'')::INT4;IF tc_period ~* ''^weekly'' THEN	tc_length := interval(''7 days'');	first_date := current_date - tc_window;ELSE	tc_length := interval(''14 days'');	first_week := to_date(fn_get_admin_value(''first week
ends''),''YYYY-MM-DD'');	first_date := current_date - tc_window;	IF (first_date - first_week)%14 < 7 then		first_date := first_date + INTERVAL(''1 week'');	END IF;END IF;wday_diff := extract(dow FROM first_date);IF wday_diff <= week_ends THEN	wday_diff := week_ends - wday_diff;ELSE	wday_diff = 7 - wday_diff + week_ends;END IF;first_date := first_date + interval(to_char(wday_diff, ''9'') || ''
days'');check_date := first_date;
DELETE FROM timecard_due_dates;
WHILE check_date <= current_date LOOP	INSERT INTO timecard_due_dates ( assignment_usq, week_ending )	SELECT assignments.usq, check_date	FROM assignments	WHERE (status > 2 OR (status < 0 AND status > -81))		AND start_date <= check_date		AND end_date > (check_date - tc_length);	check_date = check_date + interval(''7 days'');END LOOP;
RETURN TRUE;
END;'
LANGUAGE 'plpgsql';

ENjoy!
Josh

______AGLIO DATABASE SOLUTIONS___________________________                                      Josh Berkus Complete information technology      josh@agliodbs.com  and data management solutions       (415) 565-7293 for law firms, small businesses        fax 621-2533   and non-profit organizations.      San Francisco