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      Antra Java Developer interview

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      Java Developer Interview

      What is the diff between union and union all?

      Interview Answers

      Anonymous

      28 Aug 2019

      union: combine two table without duplication union all: with duplication

      Anonymous

      4 Mar 2017

      Union statement combines result of two or more SELECT statement, the UNION statement only select distinct values, while UNION ALL select all the values including the duplicates.

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