July 2024
Intermediate to advanced
1032 pages
36h 33m
English
Content preview from Information Modeling and Relational Databases, 3rd Edition
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4 Uniqueness Constraints
Abstract
This chapter discusses how to add uniqueness constraints (UCs) to an ORM conceptual schema. It covers internal UCs on unary, binary, and longer fact types as well as external UCs between fact types. It then shows how to check that the fact types are atomic.
Keywords
ORM; Uniqueness constraint; Conceptual join; Arity check; Projection; Join
4.1 Introduction to CSDP Step 4
So far, the conceptual schema design procedure (CSDP) has focused on specifying the elementary fact types, ...
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