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Oracle9i Database Administrator

Oracle Exams Training Explain the uses of the control file

Examine the structure of student table:
Name Null Type
STU ID NOT NULL NUMBER(3)
NAME VARCHER2(25)
ADDRESS VARCHER2(50)
GRADUATION DATE
Currently the table is empty. You have decided that null values should not be
allowed for the NAME column. Which statement restricts NULL values from being
entered into column?

A. ALTER TABLE student ADD CONSTRAINT name(NOT NULL);
B. ALTER TABLE student ADD CONSTRAINT NOT NULL (name);
C. ALTER TABLE student MODIFY CONSTRAINT name(NOT NULL);
D. ALTER TABLE student MODIFY(name varcher2(25) NOT NULL);

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Answer: D

Explanation:
Answer D is correct because this query add NOT NULL constraint to
Student table
Incorrect Answers:
A: Incorrect ADD CONSTRAINT clause in ALTER TABLE command.
B: Incorrect ADD CONSTRAINT clause in ALTER TABLE command.
C: Incorrect syntax using MODIFY clause of ALTER TABLE command. There is no
MODIFY CONSTRAINT clause in ALTER TABLE command.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 143
Chapter 4: Creating Other Database Objects in Oracle