The RPAD function returns an right padded expression to a specified length with the specified characters.
Rpad syntax
RPAD( expression, length, [ pad_expression ] )
Rpad example
select rpad('learn', 5) from dual;
Result: learn
select rpad('learn', 3) from dual;
Result: lea
select rpad('learn', 6,'0') from dual;
Result: learn0
select rpad('learn', 7,'0') from dual;
Result: learn00
select rpad('learn', 7,'0') from dual;
Result: learn000