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MySQL conditional INSERT

chaseivey asked
Last Modified: 2012-05-09

I am trying to do a conditional INSERT based on whether a product # already exists in my table.
Does anyone know how to do this?  I have tried several options, including the EXISTS and IF clauses, but it keeps throwing a syntax error.  Here's what I've tried so far:

INSERT INTO products ( productNum, price )
VALUES (12345, 100)
WHERE NOT EXISTS ( SELECT * FROM products WHERE productNum=12345 )


IF NOT EXISTS (  SELECT * FROM products WHERE productNum=12345 )
THEN INSERT INTO products ( productNum, price )
           VALUES (12345, 100)

Any ideas?
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