The column names in the combined result set will be the same as in the first SELECT statement. That final result set contains all rows returned by the SELECT statements involved in that UNION query but without duplicate values. What does the UNION operator do? It combines the results of several SELECT commands, removes duplicate results, and creates a single result set. The MySQL UNION operator allows us to perform this operation easier than by using numerous SELECT statements with the WHERE conditions and then combining their results manually. Usually, we keep our data in different tables and need to retrieve it and combine it into a single output. Relational database management systems suggest storing data in tables that relate to each other. MySQL UNION operator: definition and purpose Visualize and execute MySQL UNIONs with GUI tools.MySQL UNION performance and optimization.Example 6: UNION for multiple keyword searches.Example 5: Simple UNION for keyword search.MySQL UNION operator: definition and purpose.This article delves into the UNION clause and its applications in MySQL, the leading relational database management system, providing insights on its definition, benefits, and effective usage. The SQL language we use to interact with databases offers plenty of effective operators to achieve this. The next challenge is to retrieve the data from that storage and ensure it is exactly what we need here and now. Today, the relational model, which utilizes interconnected tables, is the most widely adopted and highly effective approach to data storage in databases. Databases are not just about data volumes and storage, equally important is how the data is organized and stored.

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