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SQL: The Complete Reference
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databases. With all of these competing alternatives, the further integration of object technologies into the world of relational databases seems certain. The specific path that this evolution will take remains the largest unknown in the future of SQL.
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SQL continues to play a major role in the computer industry, and appears poised to continue as an important core technology: I SQL-based databases are flagship software products for the three largest software vendors in the world: Microsoft, Oracle, and IBM. I SQL-based databases operate on all classes of computer systems, from mainframes and database servers to desktop computer clients, notebook computers, and handheld PDAs. I All of the major enterprise applications used in large organizations rely on enterprise-class SQL databases to store and structure their data. I SQL-based databases have responded successfully to the challenges of the object model, with SQL extensions in object/relational databases. I SQL-based databases are responding to the needs of Internet-based architectures by incorporating XML and integrating with application servers.
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Part VII
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Appendixes
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Copyright 2002 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
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The Sample Database
Copyright 2002 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
SQL: The Complete Reference
ost of the examples in this book are based on the sample database described in this appendix. The sample database contains data that supports a simple order processing application for a small distribution company. It consists of five tables:
I CUSTOMERS. Contains one row for each of the company s customers. I SALESREPS. Contains one row for each of the company s ten salespeople. I OFFICES. Contains one row for each of the company s five sales offices where the salespeople work. I PRODUCTS. Contains one row for each type of product that is available for sale. I ORDERS. Contains one row for each order placed by a customer. For simplicity, each order is assumed to be for a single product. Figure A-1 graphically shows the five tables, the columns that they contain, and the parent/child relationships among them. The primary key of each table is shaded. The five tables in the sample database can be created using the CREATE TABLE statements shown here:
CREATE TABLE (CUST_NUM COMPANY CUST_REP CREDIT_LIMIT PRIMARY KEY FOREIGN KEY REFERENCES ON DELETE CREATE TABLE (OFFICE CITY REGION MGR TARGET SALES PRIMARY KEY FOREIGN KEY REFERENCES ON DELETE CUSTOMERS INTEGER NOT NULL, VARCHAR(20) NOT NULL, INTEGER, MONEY, (CUST_NUM), HASREP (CUST_REP) SALESREPS SET NULL) OFFICES INTEGER NOT NULL, VARCHAR(15) NOT NULL, VARCHAR(10) NOT NULL, INTEGER, MONEY, MONEY NOT NULL, (OFFICE), HASMGR (MGR) SALESREPS SET NULL)
Appendix A:
The Sample Database
CREATE TABLE (EMPL_NUM NAME AGE REP_OFFICE TITLE HIRE_DATE MANAGER QUOTA SALES PRIMARY KEY FOREIGN KEY REFERENCES ON DELETE FOREIGN KEY REFERENCES ON DELETE CREATE TABLE (ORDER_NUM ORDER_DATE CUST REP MFR PRODUCT QTY AMOUNT PRIMARY KEY FOREIGN KEY REFERENCES ON DELETE FOREIGN KEY REFERENCES ON DELETE FOREIGN KEY REFERENCES ON DELETE
SALESREPS INTEGER NOT NULL, VARCHAR(15) NOT NULL, INTEGER, INTEGER, VARCHAR(10), DATE NOT NULL, INTEGER, MONEY, MONEY NOT NULL, (EMPL_NUM), (MANAGER) SALESREPS SET NULL, WORKSIN (REP_OFFICE) OFFICES SET NULL) ORDERS INTEGER NOT NULL, DATE NOT NULL, INTEGER NOT NULL, INTEGER, CHAR(3) NOT NULL, CHAR(5) NOT NULL, INTEGER NOT NULL, MONEY NOT NULL, (ORDER_NUM), PLACEDBY (CUST) CUSTOMERS CASCADE, TAKENBY (REP) SALESREPS SET NULL, ISFOR (MFR, PRODUCT) PRODUCTS RESTRICT)
APPENDIXES
SQL: The Complete Reference
Figure A-1.
The structure of the sample database
CREATE TABLE (MFR_ID PRODUCT_ID DESCRIPTION PRICE QTY_ON_HAND PRIMARY KEY
PRODUCTS CHAR(3) NOT NULL, CHAR(5) NOT NULL, VARCHAR(20) NOT NULL, MONEY NOT NULL, INTEGER NOT NULL, (MFR_ID, PRODUCT_ID))
Figures A-2 through A-6 show the contents of each of the five tables in the sample database. The query results in examples throughout the book are based on the data shown in these figures.
Appendix A:
The Sample Database
APPENDIXES
Figure A-2.
The CUSTOMERS table
Figure A-3.
The SALESREPS table
SQL: The Complete Reference
Figure A-4.
The OFFICES table
Figure A-5.
The ORDERS table
Appendix A:
The Sample Database
APPENDIXES
Figure A-6.
The PRODUCTS table
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Appendix B
Database Vendor Profiles
Copyright 2002 by The McGraw-Hill Companies, Inc. Click Here for Terms of Use.
SQL: The Complete Reference
he database systems vendors profiled in this appendix have been selected because of their unique positions within the broader database industry. They include the providers of the leading enterprise-class DBMS products, some smaller companies that are leaders in new technology areas, pioneers in newer segments of the database market, and vendors that focus on embeddable database technology. Any compilation like this cannot possibly be exhaustive, and the omission of a company does not mean that its products or capabilities are inferior to those of the vendors profiled here. Collectively, these companies and their profiles as presented, illustrate the landscape of today s multibillion-dollar database software and services market. The vendors are:
I A2i, Inc. I Arbor Software (now Hyperion Solutions Corporation) I Birdstep Technology I Computer Associates (Jasmine, Ingres) I Computer Corporation of America (Model 204) I Empress Software I eXcelon (ObjectStore, XIS) I Gupta Technologies (SQLBase) I Hewlett-Packard (NonStop SQL) I IBM Corporation (DB2, Informix, Cloudscape) I Informix Software (now part of IBM) I Microsoft Corporation (SQL Server) I MySQL AB I Objectivity I Oracle Corporation (Oracle, Rdb/VMS) I Persistence Software I Pervasive Software I PointBase I PostgreSQL I Quadbase Systems I Red Brick Systems (now part of Informix Software) I Sybase, Inc. I TimesTen Performance Software I Versant Corporation
Appendix B:
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