Mask selected column for selected users

I am looking into a virtual private database for selected columns.  From
what I read, it appears that the column selected will be assigned a null
value.  Other than creating a view , is there any other way to mask a
selected column for selected people.
 
 
Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113

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