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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. The user Alice wants to grant all users query privileges on her DEPT table. Which SQL statement accomplishes this?

A) GRANT select ON dept TO ALL;
B) GRANT QUERY ON dept TO ALL_USERS
C) GRANT select ON dept TO ALL_USERS;
D) GRANT select ON dept TO PUBLIC;

2. Examine the statement:
Create synonym emp for hr.employees;
What happens when you issue the statement?

A) You will have two identical tables in the HR schema with different names.
B) You create a table called employees in the HR schema based on you EMP table.
C) You create an alternative name for the employees table in the HR schema in your own schema.
D) An error is generated.

3. 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 110 and 106 are deleted from the EMPLOYEES table.
B) The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.
C) The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.
D) The statement fails because there are child records in the EMPLOYEES table with department ID 40.
E) Only the row with department ID 40 is deleted in the DEPARTMENTS table.
F) 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.

4. You own a table called EMPLOYEES with this table structure:
EMPLOYEE_ID NUMBER Primary Key FIRST_NAME VARCHAR2(25) LAST_NAME VARCHAR2(25) HIRE_DATE DATE
What happens when you execute this DELETE statement?
DELETE employees;

A) The data and structure of the EMPLOYEES table are deleted.
B) The data in the EMPLOYEES table is deleted but not the structure.
C) You get an error because of a primary key violation.
D) You get an error because the statement is not syntactically correct.

5. Examine the structure of the EMPLOYEES table:

You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?

A) CREATE INDEX NAME_IDX
ON employees(first_name, last_name);
B) CREATE INDEX NAME_IDX
ON (first_name, last_name);
C) CREATE INDEX NAME_IDX (first_name, last_name);
D) CREATE INDEX NAME_IDX
FOR employees(first_name, last_name);
E) CREATE INDEX NAME_IDX
ON employees (first_name AND last_name);
F) CREATE INDEX NAME_IDX (first_name AND last_name);

Solutions: