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Oracle Exams Training Describe the logical structure of tablespaces within the database

Examine the structure of STUDENT table.
NAME NULL TYPE
STUDENT ID NOT NULL NUMBER(3)
NAME NOT NULL VARCHAR2(25)
PHONE NOT NULL VARCHAR2(9)
ADDRESS VARCHAR2(50)
GRADUATION DATE
There are hundred records in the student table. You need to modify the Phone
column to hold only numeric value. Which statement will modify the data type of
the Phone column?

A. ALTER TABLE student MODIFY phone NUMBER(9)
B. ALTER STUDENT table MODIFY COLUMN phone NUMBER(9);
C. You can not modify a VARCHAR2 data type to a NUMBER data type for a
D. Column.
E. You cannot modify the data type of a column if there is data in the column.

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Answer: E

Explanation:
Answer E is correct because Phone column in STUDENT table has NOT NULL
constraint, which does not allows to modify data type of a column if there is data in the
column.
Incorrect Answers:
A: The statement will fail because it is incorrect way to change data type for column with
NOT NULL constraint on it.
B: There is a wrong syntax 'ALTER STUDENT table' and 'MODIFY COLUMN' in the
statement.
C: It is possible to modify VARCHAR2 data type to NUMBER data type (with some
restrictions).
D: Does not exists in question
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 141-142
Chapter 4: Creating Other Database Objects in Oracle