After completing this unit, you should be able to: Define the terms

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1 Introduction Copyright IBM Corporation 2007 Course materials may not be reproduced in whole or in part without the prior written permission of IBM

2 Unit Objectives After completing this unit, you should be able to: Define the terms Database, table, row, column, view State the more common DB2 data types List the most commonly used SQL statements in the Data definition language (DDL) Data manipulation language (DML) Data control language (DCL) State three null characteristics and their meaning

3 Computerless Data Storage Departments Projects Employees

4 Relational Database Management System EMPLOYEE EMPNO FIRSTNME CHRISTINE MID INIT I WORK LASTNAME... DEPT HAAS A00 DEPARTMENT DEPT NO A00 DEPTNAME SPIFFY COMPUTER SERVICE DIV MICHAEL L THOMPSON B01 B01 PLANNING SALLY A KWAN C01 C01 INFORMATION CENTER JOHN B GEYER E01 D01 DEVELOPMENT CENTER IRVING F STERN D11 D11 MANUFACTURING SYSTEMS EVA D PULASKI D21 D21 ADMINISTRATION SYSTEMS PROJECT PROJNO PROJNAME DEPT NO... Database A collection of tables AD3100 AD3110 AD3111 ADMIN SERVICES GENERAL ADMIN SYSTEMS PAYROLL PROGRAMMING D01 D21 D21 AD3112 AD3113 IF1000 PERSONNEL PROGRAMMING ACCOUNT PROGRAMMING QUERY SERVICES D21 D21 C01

5 Computerless Data Retrieval Please give me a list of all employees in department D11 sorted by name HAAS I CHRISTINA GOUNOT R JASON E GEYER B JOHN E BROWN DAVID D ADAMSON BRUCE D11

6 Asking for Information - RDBMS Return a list of employees in department D11 sorted by last name EMPLOYEE EMPNO LASTNAME MID INIT ADAMSON RDBMS FIRSTNME WORKDEPT PHONENO BRUCE D BROWN DAVID D GEYER B JOHN E GOUNOT R JASON E HAAS T CHRISTINE A SELECT * FROM EMPLOYEE WHERE WORKDEPT = 'D11' ORDER BY LASTNAME SELECT Statement

7 SQL Structured Query Language

8 Table USERA.EMPLOYEE EMPNO FIRSTNME MIDINIT LASTNAME... BIRTHDATE COMM CHRISTINE I HAAS MICHAEL L THOMSON row SALLY A KWAN JOHN B GEYER WING LEE column text column date column numeric column

9 Table Name Construction Qualified Table Name USERA.EMPLOYEE Table owner / Schema Simple Name USERA EMPLOYEE

10 Sample Numeric Data Types Data Type SMALLINT Comment Whole numbers from to INTEGER Whole numbers from -2,147,483,648 to +2,147,483,647 DECIMAL(m,n) Decimal numbers with max. 31 digits m = total number of digits n = number of decimal digits

11 Sample Alphanumeric Data Types Data Type Comment CHAR(n) or CHARACTER(n) STRING (fixed length) VARCHAR(n) STRING (variable length)

12 Date Data Type Data Type Comment DATE Display / Input Format YYYYMMDD USA mm/dd/yyyy EUR dd.mm.yyyy ISO yyyy-mm-dd JIS yyyy-mm-dd DATE / TIME / TIMESTAMP data type - input verification allows arithmetic sorting component extraction

13 Time Data Type Data Type Comment TIME HHMMSS Display / Input Formats USA hh:mm AM or PM EUR hh.mm.ss ISO hh.mm.ss JIS hh:mm:ss

14 Create Table CREATE TABLE EMPLOYEE ( EMPNO CHAR(6) NOT NULL, FIRSTNME VARCHAR(12) NOT NULL, MIDINIT CHAR(1) NOT NULL, LASTNAME VARCHAR(15) NOT NULL, WORKDEPT CHAR(3), BIRTHDATE DATE, SALARY DECIMAL(9,2), BONUS DECIMAL(9,2), COMM DECIMAL(9,2) )

15 NULL Characteristic "nullable" Column can be marked as having an 'unknown value' NOT NULL Column must always have a value NOT NULL WITH Column must always have a value DEFAULT if we do not supply one, a system [(value)] or user defined default value will be supplied

16 Authorization GRANT SELECT ON PROJECT TO SALLY DEPARTMENT EMPLOYEE PROJECT REVOKE SELECT ON PROJECT FROM SALLY

17 VIEW You only see what you should EMPNO FIRSTNME MIDINIT LASTNAME WORKDEPT PHONENO BRUCE DAVID JOHN JASON B R ADAMSON BROWN GEYER GOUNOT D11 D11 E01 E CHRISTINE T HAAS A Data security Simplification

18 Checkpoint 1. True or False? A database is a collection of tables. 2. What are some of the advantages of using date data types? 3. Name the alphanumeric and numeric data types covered in this unit. 4. Name the types of SQL statements in the Data Manipulation Language (DML).

19 Checkpoint Solutions 1. True 2. Automatic verification of correctness Date arithmetic Date, time, timestamp sorting Extraction of components 3. CHAR/CHARACTER (fixed length) VARCHAR (variable length) SMALLINT INTEGER, INT DECIMAL(x,y), DEC(x,y) 4. SELECT INSERT UPDATE DELETE

20 Unit Summary Having completed this unit, you should be able to: Define the terms Database, table, row, column, view State the more common DB2 data types List the most commonly used SQL statements in the Data definition language (DDL) Data manipulation language (DML) Data control language (DCL) State three null characteristics and their meaning

Maintaining Data 3.3.1

Maintaining Data 3.3.1 Maintaining Data Course materials may not be reproduced in whole or in part without the prior written permission of IBM. 4.0.3 3.3.1 Unit Objectives After completing this unit, you should be able to: Create