Thanks for the help.
I couldn't wait so I created the table anyway with varchar2 (1). Its nice to know I was not totally off track. I think I will try number though since I am going to bind it to a checkbox anyway.

>I suppose you could also use a varchar(1) column and store...
>.t. and .f. or t and f in it...
>
>The numeric column does however bind well to a check box without special code.