What is the difference between UNION and UNION ALL in SQL?

What is the difference between UNION and UNION ALL in SQL?

What is the difference between UNION and UNION ALL in SQL?

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November 19, 2010 at 5:44 PM

Hi,

UNION is an SQL keyword used to merge the results of two or more tables using a Select statement, containing the same fields, with removed duplicate values(selects distinct values). UNION ALL does the same, however it persists duplicate values i.e. UNION ALL selects all values.

Thanks,









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