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1 Journal of Applied Computer Science

1 1998

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New definitions of relational operations for nested relations

Krzemiński P., Myszkorowski K.

Journal of Applied Computer Science

1998

Vol. 6, nr 1

5-24

In this paper, extended projection and join operators for nested relations will be defined. Such relations arise by rejection of the first normal form as a standard valid for flat relations. They are characterised by occurrence of both attributes with atomic domains and complex attributes whose value is a certain subrelation. The described operators are an extension of projection and join operators of nested relations belonging to algebra as proposed in [10]. They will be defined for a wider class of relations, and they will permit to handle the nested schemas more freely. Both the operators will also act inside the relation class in their partitioned normal form.