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

By James L. Johnson

Accomplished, exact, and available, Database: types, Languages, layout is a perfect textual content for the introductory machine technological know-how direction in database concept. it might probably additionally function a self-study advisor for database practitioners. via his invaluable association of the cloth and his finished, lucid motives of the innovations, Johnson offers a transparent creation to either conventional and glossy issues in database idea. Use of a working instance set (an aquarium database) all through offers a powerful feel of continuity.
This textual content describes 5 database versions which signify present perform (the relational model), developments (the object-oriented and deductive models), and previous reports (the community and hierarchical models). scholars can simply stick with the evolution from one version to the subsequent as the similar positive factors are lined for every kind of database.

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Recall that a key is an attribute whose value uniquely identifies a tuple. Assuming that bno and sno are keys of the boat and sailor relations respectively, you can express instances of the boat-sailor relationship by tabulating (bno, sno) pairs. 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.

The answer to the query is "yes" if and only if some tuple in the mission relation contains sno = 25, cno = 82, pno = 91. The meaning of the relationship resides in the three-way connection among ship, cargo, and port. Instance groupings are triplets, containing one key from each entity. You might feel that the same meaning resides in three many-to-many binary relationships: ship-cargo, cargo-port, and port-ship. However, this isn't so. 17, identifying three intersection entities. A ship-cargo pair is a shipment, a cargo-port pair is an arrival, and a port-ship pair is a docking.

The connection between the tank number in the fish relation and the tank number in the tank relation remains in the user's mind, that is, in the user's interpretationof these attributes. 4 gives a complete definition of the aquarium relational database. Because the database setup phase does not specifically define relationships, a certain flexibility remains for new interpretations of the data. Initially, the aquarium database design envisioned only three relationships: between a fish and the tank inhabited, between a fish and the species represented, and between a fish and the events experienced.

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