SQL UNION OPERATOR

Ankit Singh

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Points:2389
Posted by  Ankit Singh
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what is use of union and union all Operator in sqlserver.
  1. aditya kumar Patel

    Post:254

    Points:1810
    Re: SQL UNION Operator

    The UNION operator is used to combine the result-set of two or more SELECT statements.

    Notice that each SELECT statement within the UNION must have the same number of columns. The columns must also have similar data types. Also, the columns in each SELECT statement must be in the same order.

    SQL UNION Syntax

    SELECT column_name(s) FROM table1
    UNION
    SELECT column_name(s) FROM table2;

    Note: The UNION operator selects only distinct values by default.

    SQL UNION ALL Syntax

    SELECT column_name(s) FROM table1
    UNION ALL
    SELECT column_name(s) FROM table2;

    Note : The UNION operator selects All (duplicate values also) values by default.

    For Exp:

    Union

    SELECT City FROM Customer
    

    UNION

    SELECT City FROM Supplier

    ORDER BY City

     

    Result :

     

     

    Union All

     

    SELECT City FROM Customer

    UNION

    SELECT City FROM Supplier

    ORDER BY City

     

    Result:

     

     

     

     

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