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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which two statements are true about WHERE and HAVING clauses? (Choose two)

A) A HAVING clause CANNOT be used in subqueries.
B) A WHERE clause can be used to restrict rows only.
C) A HAVING clause can be used to restrict groups only.
D) A HAVING clause can be used to restrict both rows and groups.
E) A WHERE clause can be used to restrict both rows and groups.
F) A WHERE clause CANNOT be used in a query of the query uses a HAVING clause.

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

3. Which two are true about aggregate functions? (Choose two.)

A) You cannot group the rows of a table by more than one column while using aggregate functions.
B) You can use aggregate functions in any clause of a SELECT statement.
C) You can use aggregate functions only in the column list of the select clause and in the WHERE clause of a SELECT statement.
D) You can pass column names, expressions, constants, or functions as parameter to an aggregate function.
E) You can mix single row columns with aggregate functions in the column list of a SELECT statement by grouping on the single row columns.
F) You can use aggregate functions on a table, only by grouping the whole table as one single group.

4. Which three are DATETIME data types that can be used when specifying column definitions? (Choose three.)

A) TIMESTAMP WITH DATABASE TIMEZONE
B) INTERVAL DAY TO SECOND
C) TIMESTAMP
D) INTERVAL MONTH TO DAY
E) INTERVAL YEAR TO MONTH

5. Examine the data in the EMPLOYEES and DEPARTMENTS tables:

Also examine the SQL statements that create the EMPLOYEES and DEPARTMENTS tables:
CREATE TABLE departments
(department_id NUMBER PRIMARY KEY,
department_name VARCHAR2(30));
CREATE TABLE employees
(EMPLOYEE_ID NUMBER PRIMARY KEY,
EMP_NAME VARCHAR2(20),
DEPT_ID NUMBER REFERENCES
departments(department_id),
MGR_ID NUMBER REFERENCES
employees(employee id),
MGR_ID NUMBER REFERENCES
employees(employee id),
JOB_ID VARCHAR2(15).
SALARY NUMBER);
ON the EMPLOYEES,
On the EMPLOYEES table, EMPLOYEE_ID is the primary key.
MGR_ID is the ID of managers and refers to the EMPLOYEE_ID.
DEPT_ID is foreign key to DEPARTMENT_ID column of the DEPARTMENTS table.
On the DEPARTMENTS table, DEPARTMENT_ID is the primary key.
Examine this DELETE statement:
DELETE
FROM departments
WHERE department id = 40;
What happens when you execute the DELETE statement?

A) The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 106 and 110 and the employees working under employee 110 are deleted from the EMPLOYEES table.
B) The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.
C) The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.
D) The statement fails because there are child records in the EMPLOYEES table with department ID 40.
E) The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 110 and 106 are deleted from the EMPLOYEES table.
F) Only the row with department ID 40 is deleted in the DEPARTMENTS table.

Solutions: