Answer Posted / prabha

A correlated subquery is a SELECT statement nested inside
another T-SQL statement, which contains a reference to one
or more columns in the outer query. Therefore, the
correlated subquery can be said to be dependent on the
outer query. This is the main difference between a
correlated subquery and just a plain subquery. A plain
subquery is not dependent on the outer query, can be run
independently of the outer query, and will return a result
set. A correlated subquery, since it is dependent on the
outer query will return a syntax errors if it is run by
itself.

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