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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which clause would you use in a SELECT statement to limit the display to those employees whose salary is greater then 5000?

A) WHERE SALARY > 5000
B) GROUP BY SALARY > 5000
C) HAVING SALARY > 5000
D) ORDER BY SALARY > 5000

2. Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns:

Which statement ensures that a value is displayed in the calculated columns for all employees?

A) SELECT last_name, 12*salary* (commission_pct,0) FROM emp;
B) SELECT last_name, 12*salary* commission_pct FROM emp;
C) SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;
D) SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;

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

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

4. Which three statements about subqueries are true? (Choose three)

A) A single row subquery can retrieve only one column and one row.
B) A single row subquery can retrieve only one row but many columns.
C) A multiple row subquery can use the "=" operator.
D) A multiple row subquery can be compared by using the ">" operator.
E) A multiple row subquery can retrieve multiple rows and multiple columns.
F) A single row subquery can use the IN operator.

5. Which data dictionary table should you query to view the object privileges granted to the user on specific columns?

A) USER_COL_PRIVS
B) USER_COL_PRIVS_MADE
C) USER_TAB_PRIVS_MADE
D) USER_TAB_PRIVS

Solutions: