Changing the column definition in a view

Dear all,
i have a problem in view , i searched first but i couldnt find any thing.
assume i have two tables and they have one field with type number, i want to make a view, and in this view, i want to redefine this number field as follows : number(3) .
how it is possible in oracle?
thank u in advance.
best,
Iman

Use CAST (your_column as NUMBER(3))
http://docs.oracle.com/cd/E11882_01/server.112/e41084/functions023.htm#SQLRF51260

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