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Efficient MINUS relacement
Posted by: Simon Cranmer
Date: April 15, 2005 01:07AM

Dear All,

I am wondering if there is a more efficient way to rewrite a MINUS union select I have. So far my only solution is to have a left join and exclude the NULL columns. E.g.

SELECT a.id
FROM a
LEFT JOIN b ON b.id = a.id
WHERE b.id IS NULL


Thanks in advance,

Simon.

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