1. An apparatus comprising: at least one processor; a memory coupled to the at least one processor; a database residing in the memory; and a graphical query interface residing in the memory and executed by the at least one processor, the graphical query interface displaying a graphical representation of at least a portion of the database, and in response to a user selection of a column in the database, the graphical query interface altering the graphical representation to make at least one column in the graphical representation unavailable for selection by the user.