Key Concepts
Only the rows that are present in both result sets are returned by the INTERSECT function when it runs on two SELECT statements. The primary prerequisite is that the two SELECT queries must have the same amount of columns and data types.
SQL Server INTERSECT Operator
In SQL Server, the INTERSECT operator is a kind of set operator that is used to combine the results of two SELECT statements and return rows which is common between them.
In this article, We will explore the syntax, key concepts, and practical examples of using the INTERSECT operator. Whether you are managing customer data, tracking orders, and handling student enrollments.
Here are some points that show the importance of the INTERSECT operator:
- When you are trying to identify similar rows between 2 sets of data, the INTERSECT operator comes in handy.
- Instead of writing complex WHERE clauses to find common rows between 2 sets with multiple conditions, the INTERSECT operator is used as an alternative.
- It offers better performance compared to any other methods.
- It improves the readability of the query in SQL.