Data Analysis for Database Design, Third Edition by David Howe

By David Howe

Facts research for database layout is a topic of significant useful price to platforms analysts and architects. This vintage textual content has been up-to-date to incorporate chapters on dispensed database structures, question optimisation and object-orientation.The SQL content material now contains good points of SQL92 and SQL ninety nine. With new databases coming on-line forever and the final enlargement of the knowledge age, it really is more and more vital to make sure that the research and version of a database layout is actual and powerful. this is often a fantastic publication for assisting you to make sure that your database is easily designed and for this reason person pleasant. elevated fabric on SQL together with the most recent advancements useful method of explaining options and ideas comprises many questions and solution guidelines

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Separation of the external schemas from the internal schema allows the latter to be tuned without changes having to be made to application programs. In what way might an application program become aware of a change in the internal schema? (1 min) 8. Suppose a particular DBMS allows only complete conceptual record types to be included in an external schema, so that an application program using the external schema always sees all the data items in a record. Compare this external schema structure with one in which it is possible to specify which data items are required.

B) The two occurrences of Carter in rows 1 and 2. (c) The two occurrences of Carter in rows 1 and 3. (d) The two occurrences of nut in rows 3 and 4. (e) The two occurrences of 5 in rows 1 and 4. (2 min) 6. Under what circumstances would it not be true that the missing partDescription in Fig. 2b could be deduced from the other data in this table? (2 min) 605 Gnkokpcvkqp"qh"tgfwpfcpe{ Although the redundancy in Fig. 2a has apparently been eliminated in the Fig. 2b version, the latter is still an unsatisfactory way of structuring the data.

B) Some duplicated data is redundant. (1 min) 2. What information would be lost if the value nut were deleted from the fourth row of the table in Fig. 1a? (1 min) 3. Suppose another row P7 nut were added to the table in Fig. 1a. Would this new value of nut be redundant? How can you tell? (1 min) 4. In Fig. 2a, which of the following are examples of redundant duplication of data values? (a) The two occurrences of the partNo value P1. (b) The two occurrences of the partDescription value bolt in rows 1 and 4.

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