How does sql process a statement containing sub-query ... Find the average compare avg with outer query */ --Scalary subquery-- --it always returns 1 row and 1 column -- multiple row subquery -- ...

In SQL Server, subqueries are often used to perform operations that involve comparisons, filtering, and retrieving data based on specific criteria. Subqueries can return single values, multiple rows, ...

When using subqueries in SQL, it is important to follow best ... Avoid using subqueries that return large tables or multiple columns, unless necessary. Test and optimize your subqueries for ...

This "property bag" scenario is a prominent use case for the XML support added to Microsoft SQL Server 2005 ... to fold similar scalar subqueries. Several such subqueries are merged into a single ...