SQL UNION ALL Tutorial: Merging Data from Multiple Queries
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SQL UNION ALL Tutorial: Merging Data from Multiple Queries
In this SQL tutorial, you'll learn how to use the UNION ALL operator to combine the results of multiple SQL queries. Unlike the regular UNION operator, UNION ALL returns all rows, including duplicates, from the SELECT queries. This makes it an ideal choice for scenarios where you need to preserve all data, regardless of duplication. We'll walk ...
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