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By Akeel I. Din

ISBN-10: 1855543575

ISBN-13: 9781855543577

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Extra info for Structured Query Language

Sample text

QUERY: SELECT * FROM SUPPLIERS WHERE CITY = 'HYBD'; . . C_NUM ----~ ~ ~ 99001 99002 99003 99004 99005 QTY --~ ~ ~ 934 467 12 456 23 CITY . . . Y. A. | 99005 rows to find these records. 5 Now let's see how the query is speeded up by using an index. If the CITY field was indexed, then the index will keep an ordered list of all the data in the CITY column as well as information that tells the DBMS where to find each record on disk. 6 shows how the index is organized. To resolve the query with condition CITY = 'HYBD', the DBMS only needs to scan through the index and find the first entry for HYBD.

NEW_CARS ; MD_NUM --------3 4 MD_NAME ----------BUICK NISSAN STYLE YEAR ------- -------ESTATE 1991 VAN 1992 This query tells SQL that we know the user ID of the person who created the table is JOE, and we want it to use this for retrieving data from NEW_CARS. Chapter 3 CREATING AND MAINTAINING TABLES Before you can do anything in SQL, someone must first create a database structure composed of related tables, and then add data to those tables. The CREATE TABLE command is used to create new tables and is a part of SQL's DDL.

For example: SELECT DEPT_NAME, SUB_NAME FROM DEPARTMENTS, SUBJECTS ; DEPT_NAME SUB_NAME --------------------- --------------------Engineering Mathematics Engineering Engineering Engineering Engineering Engineering Engineering Engineering Engineering Engineering Arts & Humanities Arts & Humanities Arts & Humanities Arts & Humanities Arts & Humanities Arts & Humanities Arts & Humanities Arts & Humanities English Lit Engineering Drwg Basic Accounts Industrial Law Organic Chemistry Physiology Anatomy Electronics Marketing Mathematics English Lit Engineering Drwg Basic Accounts Industrial Law Organic Chemistry Physiology Anatomy The information retrieved by a cartesian product query can quickly grow if more than two tables are specified.

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Structured Query Language by Akeel I. Din


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