Answer Posted / mkd
A subquery is a SELECT statement that is nested within
another T-SQL statement. A subquery SELECT statement if
executed independently of the T-SQL statement, in which it
is nested, will return a result set. Meaning a subquery
SELECT statement can standalone and is not depended on the
statement in which it is nested.
Sometimes the criteria for determining which set of records
will be affected by a SELECT, UPDATE, DELETE and/or INSERT
statement cannot be obtained by hard coding the selection
criteria. Occasionally there is a need to use the results
of a SELECT statement to help determine which records are
returned or are affected by a T-SQL statement. When a
SELECT statement is used inside another statement, the
inside SELECT statement is known as a subquery.
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