11.   The project is also incorporating existing machine-readable data files, relating to the nineteenth century, into its relational database.

12.   These are normally limited to relational databases.

13.   This is all standard for relational databases.

14.   A key difference to conventional relational databases lies in the sheer size of data objects which multimedia databases must handle.

15.   Increasingly, however, relational database management systems are being used so that they are now by far the most common database management systems.

16.   As well as simplifying the relations, normalisation also reduces anomalies which may otherwise occur when manipulating the relations in a relational database.

17.   No links need be set up in a relational database between relations.

18.   One of the most interesting aspects of relational databases are their data manipulation languages.

19.   Of the approaches to database design, relational databases are possibly the most flexible, as access paths can be defined as and when necessary using the JOIN operator.

20.   Relational databases do not have this problem.