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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. What is true about sequences?

A) Only the DBA can control which sequence is used by a certain table.
B) Once created, a sequence is automatically available to all users.
C) Once created, a sequence belongs to a specific schema.
D) Once created, a sequence is linked to a specific table.
E) Once created, a sequence is automatically used in all INSERT and UPDATE statements.

2. Evaluate these two SQL statements:
SELECT last_name, salary , hire_date
FROM EMPLOYEES
ORDER BY salary DESC;
SELECT last_name, salary, hire_date
FROM EMPLOYEES
ORDER BY 2 DESC;
What is true about them?

A) The two statements produce identical results.
B) The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
C) The second statement returns a syntax error.
D) There is no need to specify DESC because the results are sorted in descending order by default.

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

A) A view cannot have an ORDER BY clause in the SELECT statement.
B) A view cannot be created with a GROUP BY clause in the SELECT statement.
C) A view can be created as a join on two or more tables.
D) A view can be created as read only.
E) A view must have aliases defined for the column names in the SELECT statement.

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

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

5. Which best describes an inline view?

A) another name for a view that contains group functions
B) a schema object
C) a subquery that is part of the FROM clause of another query
D) a subquery that can contain an ORDER BY clause

Solutions: