Latest Tutorials| Questions and Answers|Ask Questions?|Site Map



Home Answers Viewqa SQL What is the Sub-Query?And what is the properties of Sub-Query?
Login         

View Questions and Answers by Category

Advertisements


 
Have Programming Question? Ask it here!
 
 
 


hemant kumar
What is the Sub-Query?And what is the properties of Sub-Query?
1 Answer(s)      3 years and 11 months ago
Posted in : SQL


What is the Sub-Query?And what is the properties of Sub-Query?


Advertisement
View Answers

November 19, 2010 at 1:13 PM


Hi,

Sub-queries are often referred to as sub-selects, as they allow a SELECT statement to be executed arbitrarily within the body of another SQL statement. A sub-query is executed by enclosing it in a set of parentheses. Sub-queries are generally used to return a single row as an atomic value, though they may be used to compare values against multiple rows with the IN keyword.

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. A subquery SELECT statement can return any number of values, and can be found in, the column list of a SELECT statement, a FROM, GROUP BY, HAVING, and/or ORDER BY clauses of a T-SQL statement. A Subquery can also be used as a parameter to a function call. Basically a subquery can be used anywhere an expression can be used.

Thanks,



Related Tutorials/Questions & Answers:
Advertisements
Advertisements
 

 

 

DMCA.com