Master SQL for Data Analysis - Union, Intersect, Except

The video tutorial covers SQL operators UNION, INTERSECT, and EXCEPT. It explains how UNION combines results from multiple tables, removing duplicates, and provides examples using customer and supplier data. The INTERSECT operator is introduced to find common rows between tables, while the EXCEPT operator is used to find distinct rows in one table that do not appear in another. The tutorial emphasizes the importance of having the same structure in SELECT queries for these operations.

What is the purpose of the UNION operator in SQL?

Explain the importance of having the same structure for the SELECT queries when using UNION.

How can you filter the list of distinct cities in a specific state using SQL?

Provide an example of how to combine results from two tables using the UNION operator.

What does the INTERSECT operator do in SQL?

Describe the EXCEPT operator and how it differs from UNION.

What are the requirements for the output of queries when using UNION, INTERSECT, or EXCEPT?