SQL & PL/SQL

Good Day,


Hi MASTER's got a little problem

got a table

DIESEL_DETAIL
___________

DATE_PO
PLATE_NO
DRIVER_NAME

I NEED TO SEARCH HERE'S MY QUERY

SELECT * FROM DIESEL_DETAIL
WHERE TO_CHAR(DATE_PO,'DD-MON-YYYY')
BETWEEN :P1_FROM
AND :P1_TO
AND PLATE_NO = :P1_PLATE_NO
OR DRIVER_NAME = :P1_DRIVER_NAME



ITS WORKING PERFECTLY BUT ITS MUST HAVE A VALUE
WHAT I WANT TO TO IS WHAT IF THE USER NOT INPUT THE VALUE
IT WILL AUTOMATICALLY EXECUTE THE WILDCARD SEARCH

IF THERE'S A POSSIBLE WAY?

THANKS MASTER'S GOOD DAY..