The LPAD function returns an left padded expression to a specified length with the specified characters.
Lpad syntax
LPAD( expression, length, [ pad_expression ] )
Lpad example
select lpad('function', 8) from dual;
Result: function
select lpad('function', 8) from dual;ect chr(66) from dual;
Result: fun
select lpad('function', 9,'0') from dual;
Result: 0function
select lpad('function', 10,'0') from dual;
Result: 00function
select lpad('function', 10,'0') from dual;
Result: 000function