Got a query that looks like:
========================================================================
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send0,card_info,category_detailsWHERE
send0.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send1,card_info,category_details where
send1.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send2,card_info,category_details where
send2.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send3,card_info,category_details where
send3.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send4,card_info,category_details where
send4.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send5,card_info,category_details where
send5.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*) FROM send6,card_info,category_details where
send6.card_id=card_info.card_id AND category_details.mcategory='e-cards' AND
card_info.main_cat=category_details.category AND send_date >= '2001/04/08' AND send_date <= '2001/05/14' group by 1,2
UNION ALL
SELECT card_info.main_cat, category_details.sub_cat_flag,count(*)
========================================================================
*Really* dreading the thought of changing it to an OUTER JOIN, and am
wondering if there would be a noticeable speed difference between going
from the UNION above to an OUTER JOIN, or should they be about the same?
Marc G. Fournier ICQ#7615664 IRC Nick: Scrappy
Systems Administrator @ hub.org
primary: scrappy@hub.org secondary: scrappy@{freebsd|postgresql}.org