exp_060.htm

来自「oracle　DBA的资料」· HTM 代码 · 共 38 行

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<p><b><span style="font-size:22pt">Explaination 060: &nbsp;</span></b></p>

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	<p>
	Increasing the commission of employee 3 by the average commission earned in department 20 will require sub-queries or joins in order to perform in a single step. Inserting into the table a <br>
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	<p>
	  new employee 10 who works for department 20 and earns a commission that is equal to the commission earned by employee 3 is correct answer also. To create a table that has the same structure as subset of columns from another table it's required to use a subquery in order to perform in a single step. <br>
	</p>

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

	<p>
	  A: This query can be done without using sub-queries or joins in order to perform in a single step. <br>
	</p>

	<p>
	  C: It is not required to use sub-queries or joins to create SQL statement for that query. <br>
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	<p>
	  F: This query can be done without using sub-queries or joins in order to perform in a single step: only two conditions in the WHERE clause should be specified.
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