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Oracle9i Database Administrator

Oracle Exams Training List the main components of the Oracle Enterprise Manager and their uses

How would you add a foreign key constraint on the dept_no column in the EMP
table. Referring to the ID column in the DEPT table?

A. Use the ALTER TABLE command with the ADD clause in the DEPT table.
B. Use the ALTER TABLE command with the ADD clause on the EMP table.
C. Use the ALTER TABLE command with the MODIFY clause on the DEPT table.
D. Use the ALTER TABLE command with the MODIFY clause on the EMP table.
E. This task cannot be accomplished.

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Answer: B

Explanation:
Answer B is correct because constraint will be created for EMP table using ALTER
TABLE command.
Incorrect Answers:
A: Foreign key constraint will not be created for DEPT table, only for EMP table. DEPT
table needs to have PRIMARY KEY for successful creation foreign key for EMP table.
C: Foreign key constraint will not be created for DEPT table and MODIFY clause is
used for different purposes.
D: MODIFY clause of ALTER TABLE command is used for different purposes.
E: It's possible to add foreign constraint after table creation.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 143
Chapter 4: Creating Other Database Objects in Oracle