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Question 74/150
Which constraint can be defined only at the column level?
Correct Answer: B
the NOT NULL constraint can be specified only at the column level, not at the table level.
Incorrect answer:
A. UNIQUE can be define at table level
C. CHECK can be define at table level
D. PRIMARY KEY can be define at table level
E. FOREIGN KEY can be define at table level
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-8
Incorrect answer:
A. UNIQUE can be define at table level
C. CHECK can be define at table level
D. PRIMARY KEY can be define at table level
E. FOREIGN KEY can be define at table level
Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-8
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