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Oracle Introduction to Oracle9i: SQL Sample Questions:

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

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

2. Which two statements about subqueries are true? (Choose two.)

A) A single row subquery can retrieve data from only one table.
B) A SQL query statement cannot display data from table B that is referred to in its subquery, unless table B is included in the main query's FROM clause.
C) A multiple-row subquery cannot be used in a condition where the LIKE operator is used for comparison.
D) A single row subquery cannot be used in a condition where the LIKE operator is used for comparison.
E) A SQL query statement can display data from table B that is referred to in its subquery, without including table B in its own FROM clause.
F) A single row subquery can retrieve data from more than one table.

3. Which is an /SQL*Plus command?

A) UPDATE
B) INSERT
C) SELECT
D) DELETE
E) DESCRIBE
F) RENAME

4. You need to produce a report for mailing labels for all customers. The mailing label must have only the customer name and address. The CUSTOMERS table has these columns:

Which SELECT statement accomplishes this task?

A) SELECT cust_id, cust_name, cust_address, cust_phone FROM customers;
B) SELECT* FROM customers;
C) SELECT cust_name, cust_address FROM customers;
D) SELECT name, address FROM customers;
E) SELECT id, name, address, phone FROM customers;

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

Solutions: