IBM DB2 9 Fundamentals certification exam study guide
The correct answer is A -- Every ORDER_NUM value entered must be unique; whenever the ORDERS table is queried rows should be displayed in order of increasing ORDER_NUM values.
If the UNIQUE clause is specified when the CREATE INDEX statement is executed, rows in the table associated with the index will not have two or more occurances of the same values in the set of columns that make up the index key.
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This was first published in July 2007