Quick Guide ToDB2

8/10/2019 Quick Guide ToDB2

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In response to recent technological advances and

changes in corporate computing options, IBM

released a version of DB2/5.0 which runs under

the Windows NT operating system. DB2/5.0 for

Windows NT is functionally the same as the

traditional mainframe DB2/2. Databases can be

created and accessed directly through the DB2

command line processor or with SQL commands

embedded in COBOL or other higher level

languages. The focus of the PC-based version ofDB2/5.0 is to provide distributed database

capability in a client/server environment.


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Logging on to the network and

DB2/5.0If the regular Windows NT screen is displayed when you sit down at

a computer, then you should log off (see the following section) and log

back on. Why? Because it is important that you know for certain how

the client is currently logged on the network. It is possible for someoneusing a different user ID to have left without logging off the system. If

you work in DB2/2 under their user ID you may have problems.

Logging on: A small window should be displayed that says Press

Ctrl + Alt + Del. Press the Ctrl+Alt+Delkeys. This will bring up a

logon dialog box. Enter yourusername(assigned by Dr. Cronan) and

yourpassword. The password is case-sensitive so enter uppercase or

lowercase letters exactly as they are given to you for your password. A

message will appear that the logon was successful.


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Logging off the network and

DB2/2

It is important to log off before you leave the computer youre

working on. If you dont log off the next person that uses that

computer can access your database.

1. Exit any current application, such as DB2/5.0.

2. Close all the open windows.

3. Press the Startbutton on the main menu bar.

4. Select the option Shut down the computer, select the Yes

button.


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Connecting to a database and

creating tables (EXERCISE 1)1. Open the IBM DB2menu (under the list of Programsin the Start

menu). Click on the DB2 Client Configuration Assistantoption.

2. A list of the databases will appear. Highlight your database, then pressthe Testbutton.

3. The IBM DB2 ODBC Driverwindow will appear. Enter your

usernameandpassword, then click on OK. The message connection

tested successfully will appear indicating that the client has established

connectivity with the server.

4. Close the IBM DB2 ODBC Driverwindow and close the DB2 Client

Configuration Assistant window.


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Accessing the DB2 command line

and creating TABLES1. Click on the DB2 command line processoroption under IBM DB2

menu option.

2. The DB2 - CLP window will appear. At the command prompt type in

CONNECT TOdatabasenameUSERusername; (Dont forgetthe semi-colon.)

3. Enter you password when prompted.

4. The screen will display the following information. Indicating that the

database is connected successfully.

Database product = DB2/NT 5.0.0

SQL authorization ID = username

Local database alias = databasename

5. At the DB2 command line prompt enter the command

CREATE TABLEtablename( column_name type,......);


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Entering data in a table

(EXERCISE 2)

At the DB2 command line prompt use the

following command format to insert data in the

tables you created.

INSERT INTOtable_nameVALUES

(value1,value2,.....);


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Data Manipulation Language

(DML) functions

SELECT [DISTINCT] [* / item1, item2, ...]

FROM userid.tablename

WHERE search-condition

GROUP BY colname1, colname2,...

HAVING search-condition

ORDER BY colname1 ASC, colname2 DESC ...

* is a wildcard indicating all columns (attributes)


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SELECT * FROM STUDENT WHEREAGE < 20 ORDER BY NAME ASC

A list of all attributes (ordered or sorted inascending order by names of students) of

students who are younger than 20 years.


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Relational Algebra PROJECT

(Attributes/Columns)SELECT colname1, colname2,... FROM STUDENT

SELECT * FROM STUDENT (This in effect is listing the entire table.)

SELECT NAME FROM STUDENT(to list only one attribute, i.e.,

NAME from the table STUDENT)

SELECT DISTINCT NAME FROM STUDENT(to list without

duplication names of all students from the table STUDENT)


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Relational Algebra SELECT

(Tuples/Rows)

SELECT * FROM STUDENT WHERE NAME='GLASS'(to list all

attributes for a student named GLASS.

SELECT NAME FROM STUDENT WHERE AGE > 20(to list names

of all students who are over 20 years of age)

SELECT DISTINCT NAME FROM STUDENT WHERE AGE > 20(to

list names of students over the age of 20 without any duplication)


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Relational Algebra JOIN

SELECT NAME FROM STUDENT WHERE SID

IN SELECT STUNUM FROM ENROLL

WHERE CLASSNAME ='BD445' )

SELECT STUDENT.NAME FROM STUDENT,

ENROLL WHERE STUDENT.SID =

ENROLL.STUNUM AND ENROLL.CLASSNAME

= 'BD445'


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Select ENROLL whereCLASSNAME='BD445' giving RESULTA.

Join RESULTA, STUDENT over

STUNUM, SID giving RESULTB.Project RESULTB over NAME giving

ANSWER.


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Other Useful SQL

SELECT * FROM STUDENT

DROP TABLE tablename (Be careful! Once you run thiscommand the table is gone.)

INSERT INTO tablename VALUES (item1, item2...)

I NSERT I NTO STUDENT VALUES

(500,'SMITH','GEOGRAPHY','FR',18)


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Other Useful SQL Continued

INSERT INTO tablename (Colname1, Colname2,...)

VALUES(item1, item2,...)

INSERT INTO STUDENT

(AGE,SID,NAME,MAJOR,GRADELVL) VALUES

(24,550,'JOHNSON','MARKETING','SN')

INSERT INTO tablename (Colname1, Colname2,...)

SELECT Colname1, Colname2, FROM other-

tablename WHERE search-condition


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DELETE FROM tablename WHERE search-condition

DELETE FROM STUDENT WHERE NAME = 'BAKER

ALTER TABLE tablename ADD colname data-type

ALTER TABLE STUDENT ADD SEX CHAR(1)


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UPDATE tablename

SET colname1 = expression 1,

colname2 = expression 2, ...WHERE search-condition

UPDATE STUDENT SET SEX = 'M ' WHERE

NAME='JONES'

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Quick Guide ToDB2