Understanding Different Union Types and Operations When working with databases, one important concept to understand is the use of unions. A union combines the results of two or more SELECT statements into a single result set. This allows you to retrieve data from multiple tables or views in a single query. In this article, we will explore the different union types and operations that can be performed. 1. Union The most basic union operation is simply called “union”. It combines the results of two or more SELECT statements, removing any duplicate rows. The columns in the SELECT statements must be in the same order and have compatible data types. Example:…