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📁 《Big C++ 》Third Edition电子书和代码全集-Part1

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<h2><font color="#009999">28.2.4 Calculations</font></h2>
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<ul>
	<li>Built-in functions:
		<blockquote><tt>
			COUNT&nbsp;&nbsp;&nbsp;SUM&nbsp;&nbsp;&nbsp;AVG&nbsp;&nbsp;&nbsp;
				MAX&nbsp;&nbsp;&nbsp;MIN
		</tt></blockquote>
	</li>
	<li>E.g.,
		<blockquote><tt>
			SELECT COUNT(*) FROM Customer WHERE State = 'CA'
		</tt></blockquote>
	</li>
	<li>The <tt>*</tt> argument applies to entire record; only valid in
		<tt>COUNT</tt></li>
	<li>Specify column for other functions:
		<blockquote><tt>
			SELECT AVG(Unit_Price) FROM Product
		</tt></blockquote>
	</li>
</ul>

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