Description: A UNION VIEW in SQL is a powerful tool that allows combining data from multiple result sets into a single result set. This technique is fundamental in managing relational databases, where data is often organized into distinct queries to maintain normalization and data integrity. UNION VIEWs are created using the UNION operator, which specifies how to combine the results of two or more SELECT statements. The UNION operator eliminates duplicate rows by default, while UNION ALL can be used to include all duplicates. UNION VIEWs not only facilitate querying complex data but also enhance the readability and organization of SQL queries, allowing developers and data analysts to extract richer and more meaningful information from their databases. Additionally, UNION VIEWs can be used to simplify the logic of applications interacting with the database, as they encapsulate the complexity of multiple queries into a single view that can be reused in different contexts.
