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Improve SQL query

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Posted - 2001-09-28 : 10:05:30

Kee writes "Hello,

I'm having problems with the used of "EXISTS"

I try to do my code using OR instead of AND, the output result is slow.

Here is my code:

SELECT distinct p.product_id
FROM product p, org o, product_membership pm, product_event_dates ped
WHERE p.product_id *= pm.product_id
and p.org_id = o.org_id
and p.product_id *= ped.product_id
and o.state = 'WA'
AND (exists (SELECT (1) FROM product_activities pal
WHERE pal.activity = 'Adventure'
AND p.product_id = pal.product_id)
OR exists (SELECT (1) FROM product_tariff_season_tact ptst
WHERE ptst.activity = 'Adventure'
AND p.product_id = ptst.product_id)
)
AND p.product_id < 5000

Once I remove the code:

OR exists (SELECT (1) FROM product_tariff_season_tact ptst
WHERE ptst.activity = 'Adventure'
AND p.product_id = ptst.product_id)

it seen to excute faster.
How can I improve this code so that the query time can be faster.
Cheers

Kee"

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