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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">28.1.3 Implementing One-to-Many Relationships
	(cont.)</font></h2>
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<ul>
	<li>Novice programmers often replicate columns:
		<ul>
			<li>Wastes space (1 or 2 items)</li>
			<li>Doesn't solve problem (4 or 12 items)</li>
		</ul>
	</li>
</ul>
<table border='1' cellpadding='4'>
	<tr><th colspan='9'>Poor design for Invoice Table</th></tr>
	<tr bgcolor='#00ffff'>
		<th>Invoice_<br>Number</th>
		<th>Customer_<br>Number</th>
		<th>Product_<br>Code1</th>
		<th>Quantity1</th>
		<th>Product_<br>Code2</th>
		<th>Quantity2</th>
		<th>Product_<br>Code3</th>
		<th>Quantity3</th>
		<th>Payment</th>
	</tr>
	<tr>
		<td align='center'><tt>INTEGER</tt></td>
		<td align='center'><tt>INTEGER</tt></td>
		<td align='center'><tt>CHAR(10)</tt></td>
		<td align='center'><tt>INTEGER</tt></td>
		<td align='center'><tt>CHAR(10)</tt></td>
		<td align='center'><tt>INTEGER</tt></td>
		<td align='center'><tt>CHAR(10)</tt></td>
		<td align='center'><tt>INTEGER</tt></td>
		<td align='center'><tt>DECIMAL(10,2)</tt></td>
	</tr>
	<tr>
		<td align='center'>11731</td>
		<td align='center'>3175</td>
		<td align='center'>116-064</td>
		<td align='center'>3</td>
		<td align='center'>257-535</td>
		<td align='center'>1</td>
		<td align='center'>643-119</td>
		<td align='center'>2</td>
		<td align='center'>0</td>
	</tr>
</table>

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