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Oracle Introduction to Oracle9i: SQL Sample Questions:

1. Which four are valid Oracle constraint types? (Choose four.)

A) NONUNIQUE
B) PRIMARY KEY
C) CHECK
D) NOT NULL
E) CONSTANT
F) CASCADE
G) UNIQUE

2. Which two statements are true regarding the ORDER BY clause? (Choose two)

A) The ORDER BY clause is executed on the client side.
B) The ORDER BY clause is executed first in the query execution.
C) The sort is in descending order by default.
D) The ORDER BY clause comes last in the SELECT statement.
E) The sort is in ascending by order by default.
F) The ORDER BY clause must precede the WHERE clause.

3. Examine the SQL statement that creates ORDERS table:
CREATE TABLE orders (SER_NO NUMBER UNIQUE, ORDER_ID NUMBER, ORDER_DATE DATE NOT NULL, STATUS VARCHAR2(10) CHECK (status IN ('CREDIT', 'CASH')), PROD_ID NUMBER REFERENCES PRODUCTS(PRODUCT_ID), ORD_TOTAL NUMBER, PRIMARY KEY (order_id, order_date));
For which columns would an index be automatically created when you execute the above SQL statement? (Choose two.)

A) composite index on ORDER_ID and ORDER_DATE
B) PROD_ID
C) SER_NO
D) ORD_TOTAL
E) ORDER_ID
F) STATUS

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

5. Which statement describes the ROWID data type?

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

Solutions: