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Think About SQL MERGE in Terms of a RIGHT JOIN
A SQL MERGE statement performs actions based on a RIGHT JOIN RIGHT JOIN is an esoteric feature in the SQL language, and hardly ever seen in the real world, because almost every RIGHT JOIN can just be expressed as an equivalent LEFT JOIN. The following two statements are equivalent: -- Popular SELECT c.first_name, c.last_name, p.amount FROM customer AS c LEFT JOIN payment AS p ON...
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