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Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts
book

Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

by John Adolph Palinski
August 2002
Intermediate to advanced content levelIntermediate to advanced
528 pages
10h 12m
English
Addison-Wesley Professional
Content preview from Oracle SQL and PL/SQL Handbook: A Guide for Data Administrators, Developers, and Business Analysts

Keys and Joins

In the previous discussions, I used terms such as primary key and join. These are important database terms. As you know, a database consists of a series of related entities. These entities will model the tables that will hold the data. The attributes that you will extract from the database will most likely be contained in several tables. A join is the process of matching records from one table to another. The entity relationships show you the entities (tables) that can be joined.

The database keys are the tools used to match the records from two different tables. Records are matched by having a common value(s) in one or more columns in the related tables. For example, suppose that the database has two tables: Departments and Employees. ...

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Publisher Resources

ISBN: 0201752948Purchase book