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2000</b></font><font color="#FF3333" ><b></b></font></td>
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<a href="ac2k0101.htm">初识Access 2000<br>
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<a href="ac2k0201.htm">窗口接口使用简介<br>
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<a href="ac2k0301.htm">用向导建立数据库</a></span></font><font color="#0000CC"><span class="p1"><a href="ac2k0301.htm">
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<a href="ac2k0401.htm">数据库的结构</a> <span class="p1"><a href="ac2k0403.htm">
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<a href="ac2k0501.htm">用表向导建立表</a></span></font> <font color="#0000CC"><span class="p1">
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<a href="ac2k0601.htm">在表中输入数据</a></span></font><font color="#0000CC"><span class="p1"><a href="ac2k0601.htm"><br>
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数据的类型和属性<br>
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<a href="ac2k0701.htm">用表设计器来创建表</a><br>
怎样为表设置主键<br>
<a href="ac2k0703.htm">为字段设置数据类型</a><br>
<a href="ac2k0704.htm">设置字段的属性（一）</a> <br>
<a href="ac2k0705.htm">设置字段的属性（二）</a> <br>
<a href="ac2k0706.htm">补充内容</a></span></span></font></p>
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<div align="center"><font color="#003333"><b><font color="#FF3333">怎样为表设置主键？</font></b></font></div>
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<p class=p2><span style="line-height:17pt"> 单击工具栏上的“视图”按钮，切换回表的设计视图，开始为表设置主键。第五课的课后补充里曾经说过主键是什么。</span></p>
<p class=p2><span style="line-height:17pt"> 设置表的主键非常简单，比如要将“订单信息表”中的“订单号”字段作为表的“主键”，只要单击“订单号”这一行中的任何位置，将这行设为当前行，然后单击工具栏上的“主键”按钮，按钮会凹陷进去，在“订单号”一行最左面的方格中出现了一个“钥匙”符号，表示“订单号”这一字段成为表的主键了。</span></p>
<p align="center"><img src="img/ac2k0703.gif" width="324" height="116" alt="设置主键">
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<p class=p2><span style="line-height:17pt"> 用这种方法设置了新的主键以后，原来的主键就会消失。如果要将表中的多个字段设置成主键，要先把鼠标移动到表最左边的方格内，当鼠标光标变成一个“向右箭头”形状时，单击鼠标左键将这行选定，然后按住键盘上的“CTRL”键，选定其它要设置成主键的行，都选好以后，单击工具栏上的“主键”按钮，选中的字段都设成“主键”了。如果想取消主键，先选中字段，然后单击工具栏上的“主键”按钮，这时字段前面的“钥匙”图标就消失了，表示这个字段不再是“主键”了。
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