Set ORACLE table fields default value to a formular

Question

I have an oracle table like this:

create table tms_transaction_tbl
(
trans_id number primary key,
location_id number,
trans_date date,
resource_id number,
ts         


        

Answer 1

You cannot refer to other columns in the DEFAULT expression

Here is the snippet from Oracle Documentation

Restriction on Default Column Values A DEFAULT expression cannot contain references to PL/SQL functions or to other columns, the pseudocolumns CURRVAL, NEXTVAL, LEVEL, PRIOR, and ROWNUM, or date constants that are not fully specified.