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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 be automatically enabled and deferred.
B. It would be automatically enabled and immediate.
C. It would remain disabled and can be enabled only by dropping the foreign key constraint and re-
creating it.
D. It would remain disabled and has to be enabled manually using the ALTER TABLE command.
Answer: A,B,C

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NO.2 Which statements are correct regarding indexes? (Choose all that apply.)
A. For each DML operation performed, the corresponding indexes are automatically updated.
B. Indexes should be created on columns that are frequently referenced as part of an expression.
C. A non-deferrable PRIMARY KEY or UNIQUE KEY constraint in a table automatically creates a unique
index.
D. When a table is dropped, the corresponding indexes are automatically dropped.
Answer: A,C,D

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