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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. 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 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.
E) Only the row with department ID 40 is deleted in the DEPARTMENTS table.
F) The statement fails because there are child records in the EMPLOYEES table with department ID 40.

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

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

3. Which SQL statement would you use to remove a view called EMP_DEPT_VU from your schema?

A) DROP emp_dept_vu;
B) DELETE VIEW emp_dept_vu;
C) REMOVE emp_dept_vu;
D) REMOVE VIEW emp_dept_vu;
E) DELETE emp_dept_vu;
F) DROP VIEW emp_dept_vu;

4. Evaluate the SQL statement:
TRUNCATE TABLE DEPT;
Which three are true about the SQL statement? (Choose three.)

A) It does not release the storage space used by the table.
B) You can NOT roll back the deletion of rows after the statement executes.
C) You can roll back the deletion of rows after the statement executes.
D) You must be the owner of the table or have DELETE ANY TABLE system privileges to truncate the DEPT table
E) An attempt to use DESCRIBE on the DEPT table after the TRUNCATE statement executes will display an error.
F) It releases the storage space used by the table.

5. What is true about joining tables through an equijoin?

A) You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
B) You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.
C) You can join a maximum of two tables through an equijoin.
D) You can join a maximum of two columns through an equijoin.
E) To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.

Solutions: