An Introduction to Data Base Design by Betty Joan Salzberg (Auth.)

By Betty Joan Salzberg (Auth.)

Hardcover: 278 pages writer: Harcourt collage Pub; First version version (January 1986) Language: English ISBN-10: 0126168709 ISBN-13: 978-0126168709

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The answer is yes, it is possibly obvious to a human being. But computers do not make observations. They must follow algorithms given by precise instructions. That is why it is necessary to formalize our intuition as much as possible. The list of all dependencies you can deduce from rules 1, 2, and 3 is called the closure of the original list of dependencies. When we group attributes with respect to dependencies, we must keep in mind that it is not only our original list of dependencies that we must consider, but also many other dependencies that can be deduced from that list.

22 Normal Form Design Theory RULE 3 (TRANSITIVITY): I f X - - > Y a n d Y - - > Z then X — > Z. Thus we can combine all three rules to obtain from NAME - - > STREET the dependency: NAME, DATE-DONATED —> STREET First, by rule 2, NAME, DATE-DONATED - - > STREET, DATE-DONATED Then, by rule 1, STREET, DATE-DONATED — > STREET By rule 3 we can combine these two dependencies to get the desired result. One sensible question to ask at this time is: Isn't it obvious that, in general, X - - > Y implies X U Z - - > Y?

No two record instances have the same PATIENT_ID and the same DATE. No two record instances have the same HOSPITAL-BILLING-NUMBER. To determine whether or not a given collection of attributes X is a key, ( 1 ) Use the X-closure algorithm of the previous section to see if all the attributes of the record type are functionally dependent on the given set X. 2-5. Keys 27 (2) If the set X has more than one attribute, make sure that no proper subset of X also has this property by checking proper subsets of X using the same closure algorithm.

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