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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. You need to write a SQL statement that returns employee name, salary, department ID, and maximum salary earned in the department of the employee for all employees who earn less than the maximum salary in their department.
Which statement accomplishes this task?

A) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a WHERE a.sal < (SELECT MAX(sal) maxsal FROM employees b GROUP BY dept_id);
B) SELECT emp_name, sal, dept_id, maxsal FROM employees, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) WHERE a.sal < maxsal;
C) SELECT a.emp_name, a.sal, b.dept_id, MAX(sal) FROM employees a, departments b WHERE a.dept_id = b.dept_id AND a.sal < MAX(sal) GROUP BY b.dept_id;
D) SELECT a.emp_name, a.sal, a.dept_id, b.maxsal FROM employees a, (SELECT dept_id, MAX(sal) maxsal FROM employees GROUP BY dept_id) b WHERE a.dept_id = b.dept_id AND a.sal < b.maxsal;

2. What is true about updates through a view?

A) When you update a view group functions are automatically computed.
B) You cannot update a view with group functions.
C) When you update a view only the constraints on the underlying table will be in effect.
D) When you update a view the constraints on the views always override the constraints on the underlying tables.

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

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

4. Which statement describes the ROWID data type?

A) Character data up to 4 gigabytes.
B) Binary data stored in an external file, up to 4 gigabytes.
C) Binary data up to 4 gigabytes.
D) Raw binary data of variable length up to 2 gigabytes.
E) A hexadecimal string representing the unique address of a row in its table.

5. The CUSTOMERS table has these columns:
CUSTOMER_ID NUMBER(4) NOT NULL
CUSTOMER_NAME VARCHAR2(100) NOT NULL
CUSTOMER_ADDRESS VARCHAR2(150)
CUSTOMER_PHONE VARCHAR2(20)
You need to produce output that states "Dear Customer customer_name, ".
The customer_name data values come from the CUSTOMER_NAME column in the CUSTOMERS table.
Which statement produces this output?

A) SELECT "Dear Customer", customer_name || ',' FROM customers;
B) SELECT 'Dear Customer ' || customer_name || ',' FROM customers;
C) SELECT "Dear Customer " || customer_name || "," FROM customers;
D) SELECT dear customer, customer_name, FROM customers;
E) SELECT 'Dear Customer ' || customer_name || ',' || FROM customers;
F) SELECT 'Dear Customer ' || customer_name ',' FROM customers;

Solutions: