Hello,
do i have to prefered to use UNION and INTERSECT or is it better with
OR and AND ?
Query example :
1. OR
SELECT a.designation, m.label FROM article a JOIN manufacturer m ON
m.id = a.manufacturer_id
WHERE a.designation || m.label ILIKE '%elec%'
OR a.designation || m.label ILIKE '%compa%'
OR a.designation || m.label ILIKE '%xs%'
2. UNION
SELECT a.designation, m.label FROM article a JOIN manufacturer m ON
m.id = a.manufacturer_id WHERE a.designation || m.label ILIKE '%elec%'
UNION
SELECT a.designation, m.label FROM article a JOIN manufacturer m ON
m.id = a.manufacturer_id WHERE a.designation || m.label ILIKE '%compa%'
UNION
SELECT a.designation, m.label FROM article a JOIN manufacturer m ON
m.id = a.manufacturer_id WHERE a.designation || m.label ILIKE '%xs%'
My actual database, is too small to see a real difference. That's why i
prefered to ask this newsgroup.
Thanks for your support,
David "Willou".
http://www.willou.net.
