PL/SQL - Overview

PL/SQL	Pl/sql basic syntax	pl/sql data types	pl/sql Variables
pl/sql Constants	pl/sql operators	pl/sql conditions	pl/sql loops
pl/sql strings	pl/sql arrays	pl/sql procedures	pl/sql functions
pl/sql cursors	pl/sql records	pl/sql exceptions

The PL/SQL programming language was developed by Oracle Corporation in the late 1980s as procedural extension language for SQL and the Oracle relational database. Following are notable facts about PL/SQL:

• PL/SQL is a completely portable, high-performance transaction-processing language.
• PL/SQL provides a built-in interpreted and OS independent programming environment.
• PL/SQL can also directly be called from the command-line SQL*Plus interface.
• Direct call can also be made from external programming language calls to database.
• PL/SQL's general syntax is based on that of ADA and Pascal programming language.
• Apart from Oracle, PL/SQL is available in TimesTen in-memory database and IBM DB2.

Features of PL/SQL

PL/SQL has the following features:

• PL/SQL is tightly integrated with SQL.
• It offers extensive error checking.
• It offers numerous data types.
• It offers a variety of programming structures.
• It supports structured programming through functions and procedures.
• It supports object-oriented programming.
• It supports developing web applications and server pages.

Advantages of PL/SQL

PL/SQL has the following advantages:

• SQL is the standard database language and PL/SQL is strongly integrated with SQL. PL/SQL supports both static and dynamic SQL. Static SQL supports DML operations and transaction control from PL/SQL block. Dynamic SQL is SQL allows embedding DDL statements in PL/SQL blocks.
• PL/SQL allows sending an entire block of statements to the database at one time. This reduces network traffic and provides high performance for the applications.
• PL/SQL gives high productivity to programmers as it can query, transform, and update data in a database.
• PL/SQL saves time on design and debugging by strong features, such as exception handling, encapsulation, data hiding, and object-oriented data types.
• Applications written in PL/SQL are fully portable.
• PL/SQL provides high security level.
• PL/SQL provides access to predefined SQL packages.
• PL/SQL provides support for Object-Oriented Programming.
• PL/SQL provides support for Developing Web Applications and Server Pages.

PL/SQL	Pl/sql basic syntax	pl/sql data types	pl/sql Variables
pl/sql Constants	pl/sql operators	pl/sql conditions	pl/sql loops
pl/sql strings	pl/sql arrays	pl/sql procedures	pl/sql functions
pl/sql cursors	pl/sql records	pl/sql exceptions

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