By John G. Sanderson (auth.)
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Additional info for A Relational Theory of Computing
Take for example the data scheme DD, denoted by Dnsn, the union of all sets dom(A) for A E U. A tuple on X s;:; U and on DD = (U, D, dom) is a function t: X--+ DnsD with t(A) E dom(A) for A EX. , t(Bm)). < B2 < 000 < Bm An entity type Eisa pair (attr(E), id(E)) , where E is an entity set name, attr(E) is a set of attributes and id(E) is a subset of attr(E) called key. The key can be empty. In this case the entity type is known as a weak entity type (as opposed to a strong entity type). An entity type is displayed by boxes with or without lines to its attributes.
B2 < 000 < Bm An entity type Eisa pair (attr(E), id(E)) , where E is an entity set name, attr(E) is a set of attributes and id(E) is a subset of attr(E) called key. The key can be empty. In this case the entity type is known as a weak entity type (as opposed to a strong entity type). An entity type is displayed by boxes with or without lines to its attributes. Weak entity types are displayed by boxes with an inner rhombus. Therefore concrete entities e of E can be now defined as tuples on attr( E).
Based on a set of type constructors, types can be constructed from basic types. A type constructor is a function from types to a new type. The constructor can be supplemented with a selector for retrieval functions (like Select) and for update functions (like Insert, Delete and Update) for values mapping from the new type to the component types or to the new type, with correctness criteria and rules for validation, with default rules, with one or several user representations, and with a physical representation or properties of the physical representation.