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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Examine the description of the STUDENTS table:

Which two aggregate functions are valid on the START_DATE column? (Choose two)

A) MAXIMUM (start_date)
B) COUNT (start_date)
C) AVG (start_date)
D) AVG (start_date, end_date)
E) SUM (start_date)
F) MIN (start_date)

2. In which two cases would you use an outer join? (Choose two.)

A) The tables being joined have only matched data.
B) The tables being joined have NOT NULL columns.
C) The columns being joined have NULL values.
D) Only when the tables have a primary key/foreign key relationship.
E) The tables being joined have both matched and unmatched data.
F) The tables being joined have only unmatched data.

3. Which two statements about subqueries are true? (Choose two.)

A) A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.
B) A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
C) A single row subquery can retrieve data from more than one table.
D) A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
E) A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
F) A single row subquery can retrieve data from only one table.

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

A) A multiple row subquery can use the "=" operator.
B) A multiple row subquery can retrieve multiple rows and multiple columns.
C) A single row subquery can use the IN operator.
D) A multiple row subquery can be compared by using the ">" operator.
E) A single row subquery can retrieve only one column and one row.
F) A single row subquery can retrieve only one row but many columns.

5. Which two statements complete a transaction? (Choose two)

A) DESCRIBE employees;
B) ROLLBACK TO SAVEPOINT C;
C) GRANT SELECT ON employees TO SCOTT;
D) ALTER TABLE employees
SET UNUSED COLUMN sal;
E) Select MAX(sal)
FROM employees
WHERE department_id = 20;
F) DELETE employees;

Solutions: