Introduction to Oracle 9i. SQL. Student Guide by Oracle Inc.

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Extra info for Introduction to Oracle 9i. SQL. Student Guide

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The order of rows is insignificant; specify the row order when the data is retrieved. 2. A column or attribute containing the employee number. The employee number identifies a unique employee in the EMPLOYEES table. In this example, the employee number column is designated as the primary key. A primary key must contain a value, and the value must be unique. 3. A column that is not a key value. A column represents one kind of data in a table; in the example, the salary of all the employees. Column order is insignificant when storing data; specify the column order when the data is retrieved.

All rights reserved. Oracle9i Application Server The Oracle9i Application Server (Oracle9iAS) runs all your applications. The Oracle9i Database stores all your data. Oracle9i Application Server is the only application server to include services for all the different server applications you’ll want to run. Oracle9iAS can run your: • Portals or Web sites • Java transactional applications • Business intelligence applications It also provides integration between users, applications, and data throughout your organization.

For example, SELECT and FROM are keywords. • A clause is a part of a SQL statement. For example, SELECT employee_id, last_name, ... is a clause. • A statement is a combination of two or more clauses. For example, SELECT * FROM employees is a SQL statement. Introduction to Oracle9i: SQL 1-4 Selecting All Columns SELECT * FROM departments; 1-5 Copyright © Oracle Corporation, 2001. All rights reserved. Selecting All Columns of All Rows You can display all columns of data in a table by following the SELECT keyword with an asterisk (*).

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