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INTRODUCTION
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also a tool for testing and executing SQL. It comes with a graphical user interface, and it is a tool that has gained much ground and momentum with developers. Data definition is covered in two nonconsecutive chapters: 3 and 7. This is done to allow you to start with SQL retrieval as soon as possible. Therefore, 3 covers only the most basic data-definition concepts (tables, datatypes, and the data dictionary). Retrieval is also spread over multiple chapters four chapters, to be precise. 4 focuses on the SELECT, WHERE, and ORDER BY clauses of the SELECT statement. The most important SQL functions are covered in 5, which also covers null values and subqueries. In 8, we start accessing multiple tables at the same time (joining tables) and aggregating query results; in other words, the FROM, the GROUP BY, and the HAVING clauses get our attention in that chapter. To finish the coverage of data retrieval with SQL, 9 revisits subqueries to show some more advanced subquery constructs. That chapter also introduces windows and analytical functions, hierarchical queries, and flashback features. 6 discusses data manipulation with SQL. The commands INSERT, UPDATE, DELETE, and MERGE are introduced. This chapter also pays attention to some topics related to data manipulation: transaction processing, read consistency, and locking. In 7, we revisit data definition, to drill down into constraints, indexes, sequences, and performance. Synonyms are explained in the same chapter. s 8 and 9 continue coverage of data retrieval with SQL. 10 introduces views. What are views, when should you use them, and what are their restrictions This chapter explores the possibilities of data manipulation via views, discusses views and performance, and introduces materialized views. 11 is about automation. SQL statements can be long, and sometimes you want to execute several in succession. 11 shows you how to develop automated scripts that you can run via SQL*Plus. Many, many Oracle databases are kept alive and healthy by automated SQL*Plus scripts written by savvy database administrators. Oracle is an object-relational database management system. Since Oracle Database 8, many objectoriented features have been added to the SQL language. As an introduction to these features, 12 provides a high-level overview of user-defined datatypes, arrays, nested tables, and multiset operators. Finally, the book ends with two appendixes. Appendix A at the end of this book provides a detailed look into the example tables used in this book s examples. Appendix B gives the exercise solutions.
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About the Case Tables
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1 describes the case tables used in the book s examples. Appendix A goes into even more detail, should you want it. The book s catalog page on the Apress.com website contains a link to a SQL*Plus script that you can use to create and populate the example tables. The direct link to that page is: http://apress.com/book/view/1430271970. When you get there, look on the left side of the page for a section entitled Book Resources . You should find a Source Code link within that section. Click on that link to download the script.
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Relational Database Systems and Oracle
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The focus of this book is writing SQL in Oracle, which is a relational database management system. This first chapter provides a brief introduction to relational database systems in general, followed by an introduction to the Oracle software environment. The main objective of this chapter is to help you find your way in the relational database jungle and to get acquainted with the most important database terminology. The first three sections discuss the main reasons for automating information systems using databases, what needs to be done to design and build relational database systems, and the various components of a relational database management system. The following sections go into more depth about the theoretical foundation of relational database management systems. This chapter also gives a brief overview of the Oracle software environment: the components of such an environment, the characteristics of those components, and what can you do with those components. The last section of this chapter introduces seven sample tables, which are used in the examples and exercises throughout this book to help you develop your SQL skills. In order to be able to formulate and execute the correct SQL statements, you ll need to understand the structures and relationships of these tables. This chapter does not cover any object-relational database features. 12 discusses the various Oracle features in that area.
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