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In this tutorial on the UNION statement in MySQL, the concept is explained as a method to add rules to existing tables. Unlike JOIN, which merges two tables horizontally, UNION appends records vertically, meaning it adds rows at the bottom of the result set. The keyword “UNION” retrieves distinct values, while “UNION ALL” includes all values, including duplicates. An example is provided with two tables: a customer table listing John Doe, Jane Myers, and Mike Daniels from Mumbai, Delhi, and Bangalore, and an employee table containing three employees with IDs 101, 102, and 103.