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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 deferred.
C. It would remain disabled and has to be enabled manually using the ALTER TABLE command.
D. It would be automatically enabled and immediate.
Answer: A,B,D
NO.2 Examine the following query:
What is the output of this query?
A. It results in an error because the ORDER BY clause should be the last clause.
B. It displays 5 percent of the products with the lowest amount sold.
C. It displays 5 percent of the products with the highest amount sold.
D. It displays the first 5 percent of the rows from the SALES table.
Answer: B