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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Exhibit

Evaluate this SQL statement: SELECT cust_id, ord_total FROM orders WHERE ord_total > ANY (SELECT ord_total FROM orders WHERE cust_id IN (SELECT cust_id FROM customers WHERE city LIKE 'New York'));
What is the result when the above query is executed?

A) Option D
B) Option C
C) Option A
D) Option F
E) Option B
F) Option E

2. Which statement adds a constraint that ensures the CUSTOMER_NAME column of the CUSTOMERS table holds a value?

A) ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;
B) ALTER TABLE customers ADD CONSTRAINT cust_name_nn CHECK customer_name NOT NULL;
C) ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn IS NOT NULL;
D) ALTER TABLE customers MODIFY name CONSTRAINT cust_name_nn NOT NULL;
E) ALTER TABLE customers MODIFY CONSTRAINT cust_name_nn CHECK customer_name IS NOT NULL;
F) ALTER TABLE customers MODIFY customer_name CONSTRAINT cust_name_nn NOT NULL;

3. The EMPLOYEES table contains these columns:
EMPLOYEE_ID NUMBER(4)
LAST_NAME VARCHAR2 (25)
JOB_ID VARCHAR2(10)
You want to search for strings that contain 'SA_' in the JOB_ID column. Which SQL statement do you use?

A) SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA\_%' ESCAPE '\';
B) SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_' ESCAPE "\";
C) SELECT employee_id, last_name, job_id FROM employees WHERE job_id = '%SA_';
D) SELECT employee_id, last_name, job_id FROM employees WHERE job_id LIKE '%SA_';

4. Which two tasks can your perform by using the TO_CHAR function? (Choose two)

A) Convert a character expression to a date
B) Convert 'TEN' to 10
C) Convert 10 to 'TEN'
D) Convert 10 to '10'
E) Convert '10' to 10
F) Convert a date to a character expression

5. Examine the description of the MARKS table:

SUBJ1 and SUBJ2 indicate the marks obtained by a student in two subjects.
Examine this SELECT statement based on the MARKS table:
SELECT subj1+subj2 total_marks, std_id
FROM marks
WHERE subj1 > AVG (subj1) AND subj2 > AVG(subj2)
ORDER BY total_marks;
What is the result of the SELECT statement?

A) The statement returns an error at the WHERE clause.
B) The statement returns an error at the SELECT clause.
C) The statement executes successfully and returns the student ID and sum of all marks for each student who obtained more than the average mark in each subject.
D) The statement returns an error at the ORDER BY clause.

Solutions: