Field value input retriction by using trigger/alter way
I have a custom table in Oracle EBS, which is xxssgil.XXSSGIL_TRIP_ORDER_LINE_TAB this table have multiple column, DELIVERY_REQUEST_ID is on of them which data type is varchar2,
but i am facing an issue for varchar2 data type, it required to change to number filed, but this filed have huge data row exist. that's why not possible to change data type currently.
any body please help me to restrict this data type varchar2 to number. if user input varchr2 and save then raise error like ~~this filed data should be number
please help me