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An alias allows you to change the name of a column in the result set

4> 5> CREATE TABLE OrderDetails ( 6>      OrderID int NOT NULL , 7>      ProductID int NOT NULL , 8>      UnitPrice money NOT NULL DEFAULT (0), 9>      Quantity smallint NOT NULL DEFAULT (1), 10>     Discount real NOT NULL DEFAULT (0) 11> ) 12> GO 1> INSERT OrderDetails VALUES(10248,11,14,12,0) 2> INSERT OrderDetails VALUES(10248,42,9.8,10,0) 3> INSERT OrderDetails VALUES(10248,72,34.8,5,0) 4> INSERT OrderDetails VALUES(10249,14,18.6,9,0) 5> INSERT OrderDetails VALUES(10249,51,42.4,40,0) 6> INSERT OrderDetails VALUES(10250,41,7.7,10,0) 7> INSERT OrderDetails VALUES(10250,51,42.4,35,0.15) 8> INSERT OrderDetails VALUES(10250,65,16.8,15,0.15) 9> INSERT OrderDetails VALUES(10251,22,16.8,6,0.05) 10> INSERT OrderDetails VALUES(10251,57,15.6,15,0.05) 11> go (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) (1 rows affected) 1> 2>    SELECT OrderID, MIN(Quantity) AS Minimum, MAX(Quantity) AS Maximum 3>    FROM OrderDetails 4>    WHERE OrderID BETWEEN 11000 AND 11002 5>    GROUP BY OrderID 6> GO OrderID     Minimum Maximum ----------- ------- ------- (0 rows affected) 1> 2> drop table OrderDetails; 3> GO