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What is the Difference between "UNION" & "UNION ALL"?

This thread contains 1 reply, has 2 voices, and was last updated by Harsh Patel 1 year ago.

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    • #54278

      Explain the core concepts regarding difference between “UNION” & “UNION ALL”


    • #54279

      The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all rows from all tables fitting your query specifics and combines them into a table. A UNION statement effectively does a SELECT DISTINCT on the results set.


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