Database: Models, Languages, Design by James L. Johnson

By James L. Johnson

Complete, targeted, and available, Database: types, Languages, layout is a perfect textual content for the introductory machine technological know-how path in database conception. it could possibly additionally function a self-study consultant for database practitioners. via his necessary association of the cloth and his finished, lucid causes of the thoughts, Johnson offers a transparent creation to either conventional and glossy themes in database idea. Use of a operating instance set (an aquarium database) all through presents a powerful experience of continuity.
This textual content describes 5 database versions which symbolize present perform (the relational model), traits (the object-oriented and deductive models), and earlier stories (the community and hierarchical models). scholars can simply persist with the evolution from one version to the following as the similar positive factors are lined for every form of database.

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Database: Models, Languages, Design

Finished, exact, and available, Database: types, Languages, layout is a perfect textual content for the introductory desktop technology direction in database conception. it might probably additionally function a self-study advisor for database practitioners. via his important association of the cloth and his complete, lucid factors of the ideas, Johnson presents a transparent creation to either conventional and glossy themes in database conception.

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Similarly, the foreign key sno in the fish table refers to the key sno of the species table, thereby maintaining the relationship between each fish and its species. Finally, a row in the event table connects with precisely one fish row through the foreign key fno in the event table. By understanding how common features lace the tables together, you can retrieve information across several tables. For example, how many fish in the tank with tno = 42 belong to a species named shark? Simply note the fish rows that have tno = 42 and copy out the corresponding sno values.

The new table is the intersection relation. It is the result of factoring the boat-sailor many-to-many relationship into two one-to-many relationships. 10. A tuple from the boat relation associates with the intersection tuples bearing the same bno value, thereby constituting an instance of the derived one-to-many relationship between boat and the intersection. Likewise a tuple from the sailor relation associates with the intersection tuples having the same sno value, giving an instance of the derived one-to-many relationship between sailor and the intersection.

11 sage 19 22 25 20 24 22 bno 101 102 103 104 105 106 raceDistance 25 32 50 25 32 32 25 32 50 Boat bname calypso sea sprite tempest up scow night stalker wind debt Race seaConditions calm light breeze storm calm stiff breeze stiff breeze storm calm light breeze bcolor blue green red blue red blue sno 21 21 21 17 17 41 12 59 59 blength 28 32 28 24 28 28 bno 101 102 103 101 103 102 105 104 105 Discovery of the race entity in the boat-sailor database A relationaldatabase represents a many-to-many relationshipwith a third table, the intersection relation, and with two new one-to-many relationshipsbetween the original entities and the new table.

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