create barcode using vb.net INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER in Java

Maker Data Matrix ECC200 in Java INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER

INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Figure 2-17. Running employees.sql using @ We have just touched on the features of SQL Developer. For further information, visit the SQL Developer home page at: http://www.oracle.com/technology/products/database/sql_developer/index.html. In 11, we will revisit SQL*Plus to cover some more advanced features that are useful in writing scripts to automate your work. In case you are curious about more SQL*Plus features, feel free to visit the Oracle online documentation or refer to the quick reference in Appendix A of this book.
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Figure 2-18. Running employees.sql using File Load
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Data Definition, Part I
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This short chapter is the first one about data definition with SQL. It s intended to get you started using SQL for data retrieval as soon as possible. Therefore, this chapter covers only the data definition basics, such as how to create simple tables using standard datatypes. In 7, we will revisit data definition with SQL and explore topics such as indexes, synonyms, and constraints. This chapter is mainly theoretical in nature in that it still offers no hands-on exercises and only a few examples. In the next chapter, you will start writing SQL commands yourself. The first section introduces the concept of database schemas and database users. In an Oracle database, tables always belong to a schema, and, in general, a schema has a database user as its owner. The second section explains how you can create simple tables, and the most common Oracle datatypes are covered in the third section. To illustrate the contents of the first three sections, the fourth section shows the CREATE TABLE commands to create the sample tables used in the examples in this book (introduced in the previous chapter), without bothering about constraints yet. The last section of this chapter covers the Oracle data dictionary. It provides a global overview of the data dictionary, lists some typical examples of data dictionary tables, and shows how to execute some simple queries against some of those data dictionary tables.
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3.1 Schemas and Users
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Before you can start creating and populating tables with SQL, you need to understand how data stored in an Oracle database is organized internally. In the previous chapter, you learned that you cannot do anything in an Oracle database if you do not identify yourself first by specifying a username and a password. This process identifies you as a certain database user. In an Oracle database there is, in general, a one-to-one relationship between database users and database schemas with the same name. Briefly, these are the differences between a database user and a database schema: A database user has a password and certain database privileges. A database schema is a logical collection of database objects (such as tables, indexes, views, and so on) that is usually owned by the user of the same name.
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Normally, when you log on to an Oracle database, you are automatically connected with the corresponding database schema with the same name. However, it is also possible that certain database users don t have their own schema; in other words, they don t have any database objects of their own, and they don t have the privileges to create them either. These schema-less users are, for example, authorized only to retrieve or manipulate data in a different database schema. For example, in SQL*Plus, you can use the CONNECT command to establish a new connection with a different schema, provided you are able to enter a valid combination of a database name and a
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DATA DEFINITION, PART I
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corresponding password. With the ALTER SESSION SET CURRENT_SCHEMA command, you can visit a different schema in SQL*Plus without changing your identity as database user, and therefore without changing any of your privileges. All of the examples and exercises in this book assume the presence of a database user BOOK, with the password BOOK, and a schema BOOK that contains the seven case tables introduced in the previous chapter. You can find all of the scripts to create the BOOK schema, to create the seven tables, and to insert the rows in the Book Resources section of this book s catalog page on the Apress website [http://apress.com/book/view/1430271970].
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