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AN OVERVIEW OF SQL
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Before you can store data in a database, you must first define the structure of the data. Suppose you want to expand the sample database by adding a table of data about the products your company sells. For each product, the data to be stored includes the following: I A three-character manufacturer ID code I A five-character product ID code I A product description of up to 30 characters I The price of the product I The quantity currently on hand This SQL CREATE TABLE statement defines a new table to store the products data:
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CREATE TABLE (MFR_ID PRODUCT_ID DESCRIPTION PRICE QTY_ON_HAND PRODUCTS CHAR(3), CHAR(5), VARCHAR(20), MONEY, INTEGER)
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Although more cryptic than the previous SQL statement examples, the CREATE TABLE statement is still fairly straightforward. It assigns the name PRODUCTS to the new table and specifies the name and type of data stored in each of its five columns.
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Once the table has been created, you can fill it with data. Here s an INSERT statement for a new shipment of 250 size 7 widgets (product ACI-41007), which cost $225.00 apiece:
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INSERT INTO PRODUCTS (MFR_ID, PRODUCT_ID, DESCRIPTION, PRICE, QTY_ON_HAND) VALUES ('ACI', '41007', 'Size 7 Widget', 225.00, 250) 1 row inserted.
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Finally, if you discover later that you no longer need to store the products data in the database, you can erase the table (and all of the data it contains) with the DROP TABLE statement:
DROP TABLE PRODUCTS Table dropped.
Summary
This quick tour of SQL showed you what SQL can do and illustrated the style of the SQL language, using eight of the most commonly used SQL statements. To summarize: I Use SQL to retrieve data from the database, using the SELECT statement. You can retrieve all or part of the stored data, sort it, and ask SQL to summarize the data, using totals and averages. I Use SQL to update the database, by adding new data with the INSERT statement, deleting data with the DELETE statement, and modifying existing data with the UPDATE statement. I Use SQL to control access to the database, by granting and revoking specific privileges for specific users with the GRANT and REVOKE statements. I Use SQL to create the database by defining the structure of new tables and dropping tables when they are no longer needed, using the CREATE and DROP statements.
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SQL in Perspective
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SQL: The Complete Reference
QL is both a de facto and an official standard language for database management. What does it mean for SQL to be a standard What role does SQL play as a database language How did SQL become a standard, and what impact is the SQL standard having on personal computers, local area networks, minicomputers, and mainframes To answer these questions, this chapter traces the history of SQL and describes its current role in the computer market.
SQL and Database Management
One of the major tasks of a computer system is to store and manage data. To handle this task, specialized computer programs known as database management systems began to appear in the late 1960s and early 1970s. A database management system, or DBMS, helped computer users to organize and structure their data and allowed the computer system to play a more active role in managing the data. Although database management systems were first developed on large mainframe systems, their popularity quickly spread to minicomputers, and then to personal computers and workstations. Today, many database management systems operate on specialized server computers. Database management has also played a key role in the explosion of computer networking and the Internet. Early database systems ran on large, monolithic computer systems, where the data, the database management software, and the user or application program accessing the database all operated on the same system. The 1980s and 1990s saw the explosion of a new client/server model for database access, in which a user or an application program running on a personal computer accesses a database on a separate computer system using a network. In the late 1990s, the increasing popularity of the Internet and the World Wide Web intertwined the worlds of networking and data management even further. Now users require little more than a web browser to access and interact with databases, not only within their own organizations, but around the world. Often, these Internet-based architectures involve three or more separate computer systems one computer that runs the web browser and interacts with the user, connected to a second system that runs an application program or application server, which is in turn connected to a third system that runs the database management system. Today, database management is very big business. Independent software companies and computer vendors ship billions of dollars worth of database management products every year. The vast majority of enterprise-class computer applications that support the daily operation of large companies and other organizations use databases. These applications include some of the fastest-growing application categories, such as Enterprise Resource Planning (ERP), Customer Relationship Management (CRM), Supply Chain Management (SCM), Sales Force Automation (SFA), and financial applications. Computer manufacturers develop and deliver server computers that are specially configured as database servers; these systems constitute a multibilliondollar-per-year market of their own. Databases provide the intelligence behind most transaction-oriented web sites, and they are used to capture and to analyze user
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