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- W4301421007 abstract "A database can be seen as a model, i.e., as a simplified and abstract description, of an external reality. In the case of relational databases, one starts by choosing certain predicates of a prescribed arity. The schema of the database consists of this set of predicates, possibly attributes, which can be seen as names for the arguments of the predicates, together with an indication of the domains where the attributes can take their values. Having chosen the schema, the representation of the external reality is given in terms of relations, which are finite extensions for the predicates in the schema. This set of relations is called an instance of the schema." @default.
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- W4301421007 date "2011-01-01" @default.
- W4301421007 modified "2023-10-14" @default.
- W4301421007 title "Introduction" @default.
- W4301421007 doi "https://doi.org/10.1007/978-3-031-01883-1_1" @default.
- W4301421007 hasPublicationYear "2011" @default.
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