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Additional info for Oracle - Introduction to Oracle9i - PL-SQL - Stude

Example text

Benefits of PL/SQL (continued) Portability: • Because PL/SQL is native to the Oracle server, you can move programs to any host environment (operating system or platform) that supports the Oracle server and PL/SQL. In other words, PL/SQL programs can run anywhere the Oracle server can run; you do not need to tailor them to each new environment. • You can also move code between the Oracle server and your application. You can write portable program packages and create libraries that can be reused in different environments.

The following example computes a 10% bonus for the employee with the EMPLOYEE_ID 176 and assigns the computed value to the v_bonus variable. This is done using the INTO clause. 10 INTO v_bonus FROM employees WHERE employee_id = 176; END; / Then you can use the variable v_bonus in another computation or insert its value into a database table. Note: To assign a value into a variable from the database, use a SELECT or FETCH statement. The FETCH statement is covered later in this course. ” 1-17 Copyright © Oracle Corporation, 2001.

The FETCH statement is covered later in this course. ” 1-17 Copyright © Oracle Corporation, 2001. All rights reserved. Scalar Data Types Every constant, variable, and parameter has a data type (or type), which specifies a storage format, constraints, and valid range of values. PL/SQL provides a variety of predefined data types. For instance, you can choose from integer, floating point, character, Boolean, date, collection, reference, and LOB types. In addition, This chapter covers the basic types that are used frequently in PL/SQL programs.

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