What is difference between Union and Union All in MS SQL?

Dung Do Tien Oct 19 2020 202

What is the difference between Union and Union All in MS SQL Server?

Have 1 answer(s) found.
  • M

    Marry Christ Oct 19 2020

    I think below is some feature difference between Union and Union All:

    UNION: Merge two or more data from Select clause, always remove the duplicate records.

    UNION ALL: Merge two or more data from Select clause, display all duplicate records.

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