A database that maintains a set of separate, related files (tables), but combines data elements from the files for queries and reports when required. The concept was developed in 1970 by Edgar Codd, ...

A very popular relational database management system (DBMS) from Oracle, introduced in 1978. Oracle was the first database product to run on a huge variety of hardware from micro to mainframe, giving ...

The heart of any relational database management system is the system catalog that documents the database objects and system settings being used. The system catalog offers a wealth of information about ...