Web Reference: The UNION operator is just for combining two or more SELECT statements. While JOIN is for selecting rows from each table, either by the inner, outer, left or right method. Learn the key differences between UNION and UNION ALL in SQL. Visual examples showing when duplicates matter, performance tips, and a decision flowchart. Sep 8, 2025 · In SQL, UNION and UNION ALL are used to combine results from multiple SELECT statements. UNION returns only unique rows, whereas UNION ALL includes all rows, keeping duplicates.
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