How to display the leading zero's in a number of oracle

Question

I have an oracle column(artnr) contains a length of 1 which is of type number(9). I want to update the number as following...

Example :

If number is 0 then i

Answer 1

If you really want to store those numbers with preceeding zeroes then you must change the datatype to varchar2. Then you can apply to_char( artnr , 'fm00009') in the update statement. Of course, this might come with unintended consequences. Go for this solution at your own risk.

You might also consider creating a view that zero-paddes the number "on the fly" when you select from that view.