Explain CTE (Common Table Expression) SQL.

1.	Explain CTE (Common Table Expression) SQL.
Answer» Generally, Common Table Expressions (CTEs) are temporary named result sets that you can use to refer to within an UPDATE, INSERT, SELECT, or DELETE statement. The CTEs can be defined by adding a WITH before an UPDATE, INSERT, DELETE, SELECT, OR MERGE statement. Several CTEs may be used within the WITH clause, separated by commas.

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