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Oracle Exams Training Set up password file authentication


You create the sales table with this command
CREATE TABLE sale.
(purchase-no NUMBER(9)
CONSTRAINT sale-purchase-no-pk PRIMARY KEY, costumer-id NUMBER(9)
CONSTRAINT sale-customer-id-nk NOT NULL);
Which index or indexes are created for this table?

A. No indexes are created for this table.
B. An index is created for purchase_no column.
C. An index is created for the customer_no column.
D. An index is created for each column.


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Answer: B

Explanation:
Answer B is correct because index will be created for PRIMARY KEY
column automatically during table creation. Also index is created for UNIQUE
constraint, but this table creation statement does not include any UNIQUE
constraint.
Incorrect Answers:
A: A system index will be created for PRIMARY KEY column.
C: An index will not be created for customer_no column.
D: Indexes will not be created for EACH column.
Oracle 8, DBA Certification Exam Guide, Jason S. Couchman, p. 110
Chapter 3: Creating Oracle Database Objects