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

Oct 19 2020 161

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

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  • 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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