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NO.1 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 remain disabled and can be enabled only by dropping the foreign key constraint and re-
creating it.
B. It would be automatically enabled and immediate.
C. It would be automatically enabled and deferred.
D. It would remain disabled and has to be enabled manually using the ALTER TABLE command.
Answer: A,B,C

NO.2 Which two statements are true regarding constraints? (Choose two.)
A. A constraint can be disabled even if the constraint column contains data.
B. A foreign key cannot contain NULL values.
C. All the constraints can be defined at the column level as well as the table level
D. A constraint is enforced only for the INSERT operation on a table.
E. A column with the UNIQUE constraint can contain NULL.
Answer: A,E

1z0-071 Solution