create barcode using vb.net Introduction to SQL, SQL*Plus, and SQL Developer in Java

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Introduction to SQL, SQL*Plus, and SQL Developer
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This chapter provides an introduction to the SQL language and two tools for working with it. The first section presents a high-level overview of the SQL language, which will give you an idea of the capabilities of this language. Then some important basic concepts of the SQL language are introduced in the second section, such as constants, literals, variables, expressions, conditions, functions, operators, operands, and so on. Finally, this chapter provides a tour of SQL*Plus and SQL Developer, the two main tools we will use throughout this book to learn the SQL language. In order to maximize the benefits of any tool, you first must learn how to use it and to identify the main features available in that tool. This is the first chapter with real SQL statement examples. It thus would be beneficial for you to have access to an Oracle database and a schema with the seven case tables introduced in 1, and described in detail in Appendix A. You can find the scripts to create that schema in the download hosted from this book s catalog page or the Source Code page on the Apresswebsite (www.apress.com). We assume that Oracle is running; database (instance) startup and shutdown are normally tasks of a system or database administrator. Specific startup and shutdown procedures might be in place in your environment. However, if you are working with a stand-alone Oracle environment, and you have enough privileges, you can try the SQL*Plus STARTUP command or use the GUI offered by Oracle Enterprise Manager to start up the database.
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2.1 Overview of SQL
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SQL (the abbreviation stands for Structured Query Language) is a language you can use in (at least) two different ways: interactively or embedded. Using SQL interactively means that you enter SQL commands via a keyboard, and you get the command results displayed on a terminal or computer screen. Using embedded SQL involves incorporating SQL commands within a program in a different programming language (such as Java or C). This book deals solely with interactive SQL usage. Although SQL is called a query language, its possibilities go far beyond simply data retrieval. Normally, the SQL language is divided into the following four command categories: Data definition (Data Definition Language, or DDL) Data manipulation (Data Manipulation Language, or DML) Retrieval Security and authorization
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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The SQL data definition commands allow you to create, modify, and remove components of a database structure. Typical database structure components are tables, views, indexes, constraints, synonyms, sequences, and so on. 1 introduced tables, columns, and constraints; other database object types (such as views, indexes, synonyms, and sequences) will be introduced in later chapters. Almost all SQL data definition commands start with one of the following three keywords: CREATE, to create a new database object ALTER, to change an aspect of the structure of an existing database object DROP, to drop (remove) a database object
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For example, with the CREATE VIEW command, you can create views. With the ALTER TABLE command, you can change the structure of a table (for example, by adding, renaming, or dropping a column). With the DROP INDEX command, you can drop an index. One of the strengths of an RDBMS is the fact that you can change the structure of a table without needing to change anything in your existing database application programs. For example, you can easily add a column or change its width with the ALTER TABLE command. In modern DBMSs such as Oracle, you can even do this while other database users or applications are connected and working on the database like changing the wheels of a train at full speed. This property of an RDBMS is known as logical data independence (see Ted Codd s rule 9, discussed in 1). Data definition is covered in more detail in s 3 and 7.
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