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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Mary has a view called EMP_DEPT_LOC_VU that was created based on the EMPLOYEES, DEPARTMENTS, and LOCATIONS tables. She granted SELECT privilege to Scott on this view.
Which option enables Scott to eliminate the need to qualify the view with the name MARY .EMP_DEP_LOC_VU each time the view is referenced?

A) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE LOCAL SYNONYM EDL_VU
FOR mary.EMP DEPT_LOC_VU;
then he can prefix the columns with this synonym.
B) Scott cannot create any synonym for Mary's view. Mary should create a private synonym
for the view and grant SELECT privilege on that synonym to Scott.
C) Scott cannot create a synonym because synonyms can be created only for tables.
D) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE SYNONYM EDL_VU
FOR mary.EMP_DEPT_LOC_VU;
then he can prefix the columns with this synonym.
E) Scott can create a synonym for the EMP_DEPT_LOC_VU by using the command:
CREATE SYNONYM EDL_VU
ON mary(EMP_DEPT_LOC_VU);
then he can prefix the columns with this synonym.
F) Scott can create a synonym for the EMP_DEPT_LOC_VU bus using the command:
CREATE PRIVATE SYNONYM EDL_VU
FOR mary.EMP DEPT_LOC_VU;
then he can prefix the columns with this synonymn.

2. Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns:

Which statement ensures that a value is displayed in the calculated columns for all employees?

A) SELECT last_name, 12*salary* (commission_pct,0) FROM emp;
B) SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;
C) SELECT last_name, 12*salary* commission_pct FROM emp;
D) SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;

3. Examine the structure of the EMP_DEPT_VU view:

Which SQL statement produces an error?

A) SELECT *
FROM emp_dept_vu;
B) SELECT department_id, job_id, AVG(salary)
FROM emp_dept_vu
GROUP BY department_id, job_id;
C) SELECT job_id, SUM(salary)
FROM emp_dept_vu
WHERE department_id IN (10,20)
GROUP BY job_id
HAVING SUM(salary) > 20000;
D) SELECT department_id, SUM(salary)
FROM emp_dept_vu
GROUP BY department_id;
E) None of the statements produce an error; all are valid.

4. Which three statements about subqueries are true? (Choose three.)

A) The subquery and main query can retrieve data from different tables.
B) A subquery can have more than one main query.
C) Multiple columns or expression can be compared between the subquery and main query.
D) Only one column or expression can be compared between the subquery and main query.
E) The subquery and main query must retrieve data from the same table.
F) A main query can have more than one subquery.

5. Which constraint can be defined only at the column level?

A) PRIMARY KEY
B) NOT NULL
C) UNIQUE
D) CHECK
E) FOREIGN KEY

Solutions: