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Which constraint can be defined only at the column level?
Correct Answer: B
Explanation/Reference: Explanation: the NOT NULL constraint can be specified only at the column level, not at the table level. Incorrect answer: AUNIQUE can be define at table level CCHECK can be define at table level DPRIMARY KEY can be define at table level EFOREIGN KEY can be define at table level Refer: Introduction to Oracle9i: SQL, Oracle University Study Guide, 10-8