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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">28.1.2 Linking Tables (cont.)</font></h2>
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			<ul>
				<li>In C++, many objects can refer to a single object</li>
				<li>To accomplish this in SQL:
					<ul>
						<li>Break data into 2 tables</li>
						<li>Solves replication problem</li>
						<li>Cust# <i>primary key</i> for Customer table
							<ul>
								<li>A <i>foreign key</i> in the Invoice table</li>
								<li>Links tables</li>
							</ul>
						</li>
					</ul>
				</li>
			</ul>
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		</td>
		<td>
			<table border='1' cellpadding='4'>
				<tr>
					<tr><th colspan='3'>Invoice</th></tr>
				</tr>
				<tr bgcolor='#00ffff'>
					<th>Invoice_<br>Number</th>
					<th>Customer_<br>Number</th>
					<th>Customer_<br>Payment</th>
				</tr>
				<tr>
					<td align='center'><tt>INTEGER</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'>0</td>
				</tr>
				<tr>
					<td align='center'>11732</td>
					<td align='center'>3176</td>
					<td align='center'>249.95</td>
				</tr>
				<tr>
					<td align='center'>11733</td>
					<td align='center'>3175</td>
					<td align='center'>0</td>
				</tr>
			</table>
		</td>
	</tr>
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