... identifying the entities of interest to the enterprise and identifying the information to be recorded about those entities. Note: Chapter 9 and Part III of the book make it clear that integrity ... assignment, together with its shorthand forms INSERT, DELETE, and UPDATE. Observe too that update operations and integrity constraints both apply specifically to relvars, not relations. The book ... data model is an abstract, self-contained, logical definition of the objects,* operators, and so forth, that together constitute the abstract machine with which users interact (the objects allow...