What is a sub-query? When would you use one?

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What is a sub-query? When would you use one?..

Answer / 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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What is a sub-query? When would you use one?..

Answer / c suresh kumar

sub query is part of main query.this useful we retrive data
from the another table.

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What is a sub-query? When would you use one?..

Answer / swapna

Subquery is used to get information from a table based on
unknown conditions.
If select stmt not perform entire task using
selection,projection,and joins then we can perform that
type of task using sub queries.

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