explain analyze SELECT t1.id, t2.url FROM referral_temp t2 LEFT OUTER JOIN d_referral t1 ON t2.url = t1.referral_raw_url ORDER BY t1.id;
What I would like to know is if there are better ways to do the join? I need to get all the rows back from the referral_temp table as they are used for assigning FK's for the fact table later in processing. When I iterate over the values that I get back those with t1.id = null I assign a new FK and push both into the d_referral table as new entries as well as a text file for later use. The matching records are written to a text file for later use.
Would something like this work any better (without disabling index scans):
SELECT t1.id, t2.url FROM referral_temp t2, d_referral t1 WHERE t1.referral_raw_url = t2.url;
<process rows with a match>
SELECT t1.id, t2.url FROM referral_temp t2 WHERE NOT EXISTS (select 1 FROM d_referral t1 WHERE t1.referral_raw_url = t2.url);
<process rows without a match>
?
Joe
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