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Nowadays, computers as well as related software systems like database management systems are available widely, so that lots of databases are created and used. Moreover, it is relatively easy to use the database management systems for small and medium sized computers because of the development of good user interfaces. But, this ease of use might play a role of some bad points in the respect of data integrity. Because relational databases are consisted of relations that resemble conventional tables, users or designers of the databases might consider that the relations are just like conventional tables and they want to store data in a small number of tables as much as possible, because the complexity of making queries from the tables is increased as the number of tables is increased.
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