Instructor's Manual for an Introduction to Database Systems by Date C.J.

By Date C.J.

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It seems to me that the database community ignored this stuff for far too long, to their cost (to ours too, as users). I could certainly quote some nonsense from the database literature in this connection. eye_color ; This request joins the Customer_Table and Zoo_animal_Table relations based on relationships phrased in terms of no_of_children, no_of_legs, and eye_color. The meaning of these relationships is not entirely clear. (End quote) This quote is taken from a book on object databases; I'll leave it as an exercise for you to deconstruct it.

Here just stress the point that the catalog in a relational system will itself consist of relvars──of course! " "What ( ( TABLE JOIN COLUMN ) WHERE COLCOUNT < 5 ) { TABNAME, COLNAME } Answer: This relational expression (or "query") yields table- and column-name pairs for tables with fewer than five columns. ──and hence explain base relvars, and go on to distinguish such relvars from "stored" ones. ) Introducing views here as another kind of relvar also serves as a little subtle softening up for the discussion of The Principle of Interchangeability in Chapter 10.

In other words, it effectively assumes an unbounded linear address space; details of how that address space maps to physical storage are highly system-specific and are deliberately omitted from the general architecture. Copyright (c) 2003 C. J. 4 ────────── • Physical database design is the process of deciding how the logical database design is to be physically represented at the stored database level. • A planned request is a request for which the need was foreseen well in advance of the time at which the request is actually to be executed.

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