A Common Table Expression (CTE) in SQL is a named temporary result set, derived
from a SELECT statement, that can be used within another SELECT, INSERT, UPDATE,
or DELETE statement. It is defined using the WITH clause followed by a SELECT
statement and a name for the CTE, and can be referred to by name in the main
query. CTEs are useful for breaking down complex queries into simpler, more
readable parts, and can also improve query performance by reducing the need to
repeat subqueries.
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