Relational Database Systems

Many reasons for the commercial success:

• they offer good performance to many business applications;

• they offer data independence;

• they provide an easy-to-use, declarative, query language;

• they have a solid theoretical basis;

• they employ sophisticated query processing and optimization techniques.

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Relational databases have been very successful in the last two decades. They offer good performance to many business applications; they offer data independence by separating the specification from the implementation; they provide an easy-to-use, declarative, query language, such as SQL; they have a solid theoretical basis (they all based on relational theory); and they employ sophisticated query processing and optimization techniques.