A friend asked me to rewrite a program for him.
Though the problem is it s using a rdb database, i am assuming this is a dec/oracle rdb database.
Which i honestly never used and have no knowledge of.
So i was wondering if there is any way to convert this to a sql database or even access so i can see what the database looks like.

Do you know if this version of RDB has an ODBC interface? If so, you can use that to migrate the data to most any current database. Oracle databases all have ODBC available. In any case, a DEC RDB database is NOT Oracle... :-)