Lab 5 Create Key Constraints With Answer

8/11/2019 Lab 5 Create Key Constraints With Answer

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DB2 for z/OS

Fundamentals

Lab Instruction

Copyright IBM Corporation 2009. All rights reserved. 1


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Lab 5 Create Key Constraints

Objectives

Learn to use SPUFI

Learn to create primary keys

Learn to create foreign keys

Content

Create different types of keys:

Primary keys

Foreign keys

Query catalog tables for key related information

Description

This lab teaches students how to use SPUFI to create DB2 key constraints. Studentsneed to log-on to TSO, go into ISPF then DB2I, and use the SPUFI menu to create key

constraints.

Bibliography

[1] DB2 Universal Database for z/OS SQL Reference, March 2004, SC18-7426-00



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5.1 Create Key Constraints

In this unit, we are going to create a few key constraints on the existing tables to ensure data

integrity. The picture below shows the relationship between these tables, which is referential

structures.

Figure 5-1 Referential Structure

The detailed description of the key constraints is as follows:

Primary Keys:

Table Name Primary Key Column(s) Constraint Name

GRADE CLASS, STUDENT PK_GRADE

CLASS CLASSNO PK_CLASSCOURSE COURSENO PK_COURSE

STUDENT STUNO PK_STUDENT

INSTRUCTOR INSTNO PK_INSTRUCTOR

Foreign Keys:

Parent Table Name Child

Table

Name

Foreign Key

Column(s)

Constraint Name Delete Rule

CLASS GRADE CLASS FK_CLR RESTRICT

STUDENT GRADE STUDENT FK_SR RESTRICT

COURSE CLASS COURSENO FK_COCL RESTRICT

INSTRUCTOR CLASS INSTRUCTOR FK_ICL RESTRICT

STUDENT STUNO

GRADE CLASS STUDENT COURSE COURSENO

CLASS CLASSNO COURSENO INSTNO

INSTRUCTOR INSTNO



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5.1.1 Define Primary Keys:

[Hint] ALTER TABLE GRADE

ADD CONSTRAINT PK_GRADE

PRIMARY KEY (CLASS, STUDENT);

ALTER TABLE CLASS

ADD CONSTRAINT PK_CLASS

PRIMARY KEY (CLASSNO);

ALTER TABLE COURSE

ADD CONSTRAINT PK_COURSE

PRIMARY KEY (COURSENO);

ALTER TABLE STUDENT

ADD CONSTRAINT PK_STUDENT

PRIMARY KEY (STUNO);

ALTER TABLE INSTRUCTOR

ADD CONSTRAINT PK_INSTRUCTOR

PRIMARY KEY (INSTNO);

5.1.2 Define Foreign Keys:

[Hint] ALTER TABLE GRADE

ADD CONSTRAINT FK_CLR

FOREIGN KEY (CLASS) REFERENCES CLASS

ON DELETE RESTRICT;

ALTER TABLE GRADE

ADD CONSTRAINT FK_SR

FOREIGN KEY (STUDENT) REFERENCES STUDENT

ON DELETE RESTRICT;



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ALTER TABLE CLASS

ADD CONSTRAINT FK_COCL

FOREIGN KEY (COURSENO) REFERENCES COURSE

ON DELETE RESTRICT;

ALTER TABLE CLASS

ADD CONSTRAINT FK_ICL

FOREIGN KEY (INSTRUCTOR) REFERENCES INSTRUCTOR

ON DELETE RESTRICT;

5.2 Query Catalog Tables

5.2.1 Query the SYSTABCONST, SYSKEYCOLUSE, SYSRELS, and

SYSFOREIGNKEYScatalog tables

[Hint] SELECT CONSTNAME, TBNAME, IXNAME, COLCOUNT

FROM SYSIBM.SYSTABCONST

WHERE TBCREATOR = USER;

SELECT CONSTNAME, TBNAME, COLNAME, COLSEQ, COLNO

FROM SYSIBM.SYSKEYCOLUSE

WHERE TBCREATOR = USER;

SELECT REFTBNAME, TBNAME, RELNAME, COLCOUNT, DELETERULE

FROM SYSIBM.SYSRELS

WHERE CREATOR = USER;

SELECT CREATOR, TBNAME, RELNAME, COLNAME, COLNO, COLSEQ

FROM SYSIBM.SYSFOREIGNKEYS

WHERE CREATOR = USER;

Observe the contents in thesecatalog tables and answer the following questions:

1.

Which kind of constraint (primary / foreign) is recorded in the SYSTABCONST table?



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2.

Do these constraints from question 1 require indexes?

3. Which kind of constraint (primary / foreign) is recorded in the SYSRELS table?

4. Do these constraints from question 1 require indexes?

5.

Which table contains information on the columns used for primary keys?

6. Which table contains information on the columns used for foreign keys?

[ANSWER]

1. Primary

2. Not necessarily

3. Foreign

4. Yes

5. SYSIBM.SYSKEYCOLUSE

6. SYSIBM.SYSFOREIGNKEYS

Lab 5 Create Key Constraints With Answer

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