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

By James L. Johnson

Complete, particular, and obtainable, Database: versions, Languages, layout is a perfect textual content for the introductory computing device technology direction in database thought. it may possibly additionally function a self-study advisor for database practitioners. via his beneficial association of the cloth and his accomplished, lucid motives of the thoughts, Johnson presents a transparent creation to either conventional and sleek themes in database conception. Use of a operating instance set (an aquarium database) all through presents a robust feel of continuity.
This textual content describes 5 database types which characterize present perform (the relational model), tendencies (the object-oriented and deductive models), and previous reviews (the community and hierarchical models). scholars can simply keep on with the evolution from one version to the subsequent as the similar positive factors are coated for every kind of database.

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A minor technicality arises because the tuples in the new table contain boat-sailor pairs. In other words, there are two attributes, the first intended to hold a boat and the second a sailor. But attribute values must be drawn from certain specified domains, such as Z, S, M, and therefore they can't be boats or sailors, which are whole tuples in themselves. However, you can use a key value to represent each tuple. 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.

A relationship is an application-specificconnection among several entities. A relationship instance is a meaningful grouping of tuples from the participatingentities that exemplifies that connection. One-to-many relationships The relationship examples considered above are binary, one-to-many relationships. A relationship is binary when it connects precisely two entities. A binary relationship is one-to-many when each instance grouping contains a single tuple from one of the entities, together with a multitude of tuples from the other.

Suppose a yacht club involves only boats and sailors. " It is intrinsically a many-to-many relationship: each boat Relational Databases 35 associates with many sailors, and each sailor associates with many boats. An instance of this boat-sailor relationship is a meaningful grouping of boat tuples and sailor tuples, a grouping that clearly indicates which sailors have sailed which boats and vice versa. Now try to construct such a grouping. Imitating the grouping patterns of a one-to-many relationship, you start with a boat tuple and then add all the sailors who have sailed on that boat.

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