TAILIEUCHUNG - Oracle Database 11g SQL P2

Oracle Database 11g SQL n this chapter, you will learn about the following: Relational databases. The Structured Query Language (SQL), which is used to access a database. SQL*Plus, Oracle’s interactive text-based tool for running SQL statements. SQL Developer, which is a graphical tool for database development. PL/SQL, Oracle’s procedural programming language. PL/SQL allows you to develop programs that are stored in the database. | CHAPTER 1 Introduction 2 Oracle Database 11g SQL n this chapter you will learn about the following Relational databases. The Structured Query Language SQL which is used to access a database. SQL Plus Oracle s interactive text-based tool for running SQL statements. SQL Developer which is a graphical tool for database development. PL SQL Oracle s procedural programming language. PL SQL allows you to develop programs that are stored in the database. Let s plunge in and consider what a relational database is. What Is a Relational Database The concept of a relational database was originally developed back in 1970 by Dr. . Codd. He laid down the theory of relational databases in his seminal paper entitled A Relational Model of Data for Large Shared Data Banks published in Communications of the ACM Association for Computing Machinery Vol. 13 No. 6 June 1970. The basic concepts of a relational database are fairly easy to understand. A relational database is a collection of related information that has been organized into tables. Each table stores data in rows the data is arranged into columns. The tables are stored in database schemas which are areas where users may store their own tables. A user may grant permissions to other users so they can access their tables. Most of us are familiar with data being stored in tables stock prices and train timetables are sometimes organized into tables. One example table used in this book records customer information for an imaginary store the table stores the customer first names last names dates of birth dobs and phone numbers first name last name dob phone John Brown 01-JAN-1965 800-555-1211 Cynthia Green 05-FEB-1968 800-555-1212 Steve White 16-MAR-1971 800-555-1213 Gail Black 800-555-1214 Doreen Blue 20-MAY-1970 This table could be stored in a variety of forms A card in a box An HTML file on a web page A table in a database An important point to remember is that the information that makes up a database is different from the .

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