exp_042.htm

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<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>Ocp test </title>
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<p><b><span style="font-size:22pt">Explaination 042: &nbsp;</span></b></p>

<span style="font-size:18pt">
	<p>
	This task can be done using the MERGE command. Correct syntax for the MERGE command is MERGE INTO table1 USING table2 on (join_condition) WHEN MATCHED UPDATE SET col1 = value WHEN NOT MATCHED INSERT (column_list) values (column_values). <br>
	</p>

	<p>
	  Incorrect Answers <br>
	</p>

	<p>
	  A: MERGE command can handle this task, not UPDATE: new employee details will not be added to the table <br>
	</p>

	<p>
	  C: This statement would by correct if UPDATE SET is syntax used, not UPDATE table_name SET syntax as in usual UPDATE command. <br>
	</p>

	<p>
	  D: "ON condition" clause of the MERGE command is absent. <br>
	</p>

	<p>
	  OCP Introduction to Oracle 9i: SQL Exam Guide, Jason Couchman, p. 273-275 <br>
	</p>

	<p>
	  Chapter 6: Manipulating Oracle Data
	</p>

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