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NO.1 Which two statements are true regarding constraints? (Choose two.)
A. A constraint is enforced only for the INSERT operation on a table.
B. All the constraints can be defined at the column level as well as the table level
C. A foreign key cannot contain NULL values.
D. A column with the UNIQUE constraint can contain NULL.
E. A constraint can be disabled even if the constraint column contains data.
Answer: D,E
NO.2 Evaluate the following SQL statements that are issued in the given order: CREATE TABLE emp
(emp_no NUMBER(2) CONSTRAINT emp_emp_no_pk PRIMARY KEY,
enameVARCHAR2(15),
salary NUMBER(8,2),
mgr_no NUMBER(2) CONSTRAINT emp_mgr_fk REFERENCES emp);
ALTER TABLE emp
DISABLE CONSTRAINT emp_emp_no_pk CASCADE;
ALTER TABLE emp
ENABLE CONSTRAINT emp_emp_no_pk;
What would be the status of the foreign key EMP_MGR_FK?
A. It would be automatically enabled and immediate.
B. It would remain disabled and can be enabled only by dropping the foreign key constraint and re-
creating it.
C. It would remain disabled and has to be enabled manually using the ALTER TABLE command.
D. It would be automatically enabled and deferred.
Answer: A,B,D
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