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SQL and XQuery tutorial for IBM DB2, Part 2: Basic queries

The fundamentals of SQL queries

Pat Moffatt (pmoffatt@ca.ibm.com), Information Management Program Manager, IBM Academic Initiative, IBM
Pat Moffatt is the Information Management Program Manager for the IBM Academic Initiative. Through the Academic Initiative program, she ensures that appropriate Information Management resources are made available to help faculty integrate Information Management software into their curriculum. To learn more about this program, visit www.ibm.com/university/data.
Bruce Creighton (bcreight@ca.ibm.com), Skills Segment Planner, IBM
Bruce Creighton is a Skills Segment Planner in the Information Management Education Planning and Development department. In this role, he plans investment in educational content and balances the investment between areas where IBM can attain revenue and those where the requirement for skills development are important enough to provide free education.
Jessica Cao, Training Tools Developer, IBM
Jessica Cao is an Arts and Science and Computer Science student at McMaster University. She expects to complete her combined honours degree in April 2009. Jessica is working in IBM Toronto lab's DB2 Information Management Skills Channel Planning and Enablement Program to take advantage of her interest in programming, editing, and writing.

Summary:  Through a series of simple examples, this tutorial illustrates how to retrieve data from an IBM® DB2® database with standard SQL SELECT statements. This tutorial describes how to retrieve rows from a relational database table, retrieve specific columns, retrieve specific rows, reform logical operations on retrieved data, and use wildcard characters in search conditions. This tutorial is Part 2 of the SQL & XQuery tutorial for IBM DB2 series.

View more content in this series

Date:  03 Aug 2006
Level:  Introductory PDF:  A4 and Letter (97 KB | 25 pages)Get Adobe® Reader®

Activity:  39943 views
Comments:  

Using the IN comparison predicate

Question

What cities are in the Chicago, New York, and New Orleans districts?

Example query

		SELECT hq_city, hq_state, district
		FROM aroma.market
		WHERE district IN
                    ('Chicago', 'New York', 'New Orleans');

Result

Hq_CityHq_StateDistrict
New OrleansLANew Orleans
HoustonTXNew Orleans
New YorkNYNew York
PhiladelphiaPANew York
ChicagoILChicago
DetroitMIChicago


Using comparison predicates

A simple condition can be expressed with the following SQL comparison predicates:

Predicate
BETWEEN expression1 AND expression2
LIKE pattern
IN (list)
IS NULL
IS NOT NULL
ALL
SOME or ANY
EXISTS

Examples of the ALL, SOME or ANY, and EXISTS predicates are presented in Part 5 of this series.

For syntax descriptions and examples of all these predicates, as well as detailed definitions of simple and complex expressions, refer to the SQL Reference Guide .

About the query

The example query lists all the cities in the Chicago, New York, and New Orleans districts. It could also be written with the equals comparison operator (=) and a set of OR conditions:

        WHERE district = 'Chicago'
			OR district = 'New York'
			OR district = 'New Orleans'

Usage notes

Strive to write logical sets of conditions that are simple, easy to understand, and easy to maintain. Always clarify the logical structure of your compound conditions with ample white space, define logical blocks by indentation, and force evaluation precedence with parentheses.

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