Operators: EXISTS and IN
Explore the functionality of EXISTS and IN operators in T-SQL subqueries. Understand how to check for the presence or absence of rows and values in related tables, enabling efficient data retrieval and filtering in Microsoft SQL Server.
We'll cover the following...
We'll cover the following...
The EXISTS operator lets us check whether a subquery returns any rows. Because no rows are yielded by the subquery as an output when EXISTS is used, we can expect a faster subquery performance. There is also the IN operator, which lets us check whether a value exists in a given range.
For our examples, we’ll use the tables in the Match ...