Difference between nested query,sub query and nested query?

What is difference between nested query,sub query and nested query? explain clearly with an example?

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arpitapatel  

  • Member Since Sep-2008 | Sep 24th, 2008

Query inside the query is nested query.
It is also called as sub query.
Correlated subquery runs once for each row selected by the outer query. It contains a reference to a value from the row selected by the outer query.

Nested subquery runs only once for the entire nesting (outer) query. It does not contain any reference to the outer query row.

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arpitapatel

  • Sep 24th, 2008
 

Query inside the query is nested query.

It is also called as sub query.

Correlated subquery runs once for each row selected by the outer query. It contains a reference to a value from the row selected by the outer query.

Nested subquery runs only once for the entire nesting (outer) query. It does not contain any reference to the outer query row.

katgeektalk

  • Aug 22nd, 2010
 

The subquerry is often reffered to as a nested SELECT, sub-SELECT, or inner SELECT statement.
The subquery generally excuted first, and its output is used to complete the query condition for the main (or outer) query.

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rams

  • Apr 3rd, 2012
 

Both are same

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