SQL | INTERSECT Clause

The SQL INTERSECT clause is a powerful tool used to retrieve common records between two SELECT queries. It ensures that only the rows present in both result sets are returned, making it ideal for finding overlapping data between two tables. The INTERSECT operator helps ensure uniqueness by removing duplicate rows and requires both SELECT statements to have the same number of columns with compatible data types.

This clause can be used in various scenarios, such as when analyzing customer data, identifying matching records between tables, or applying filters like BETWEEN and LIKE. Using INTERSECT with operators like BETWEEN or LIKE helps refine results by specifying conditions for matching records. It is crucial to note that while INTERSECT can be slower on large datasets, optimizing it with indexing can improve performance.

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