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<title>●试题三</title>
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<body lang=ZH-CN style='tab-interval:21.0pt;text-justify-trim:punctuation'>
<div class=Section1>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>●试题三<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［问题</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><span style="mso-spacerun:
yes"> </span>Customer(<u>idno</u></span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>name</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>address</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>phone)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'><span style="mso-spacerun:
yes"> </span>Account(<u>Ano</u></span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>balance</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Bname)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Bname reference Branch(Bname)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Deposit(<u>idno</u></span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><u><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Ano</span></u><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>idno reference Customer(idno)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Ano reference Account(Ano)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Branch(<u>Bname</u></span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>city)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Loan(<u>Lno</u></span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Bname</span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>amount)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Bname reference Branch(Bname)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Borrow(<u>idno</u></span><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，</span><u><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Lno</span></u><span lang=EN-US
style='mso-bidi-font-size:10.5pt'>)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>idno reference Customer(idno)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>Lno reference Loan(Lno)<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［问题</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>(1)Borrow.Lno=Loan.Lno(2)COUNT(distinct
idno)>=2<o:p></o:p></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>［问题</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>3</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>］<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>【答案】这样的系统算不上分布式数据库系统。分布式数据库系统并不是简单地把集中式数据库系统安装在不同场地，用网络连接起来实现的</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>(</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>这是分散的数据库系统</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>)</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>，它是具有自己的性质和特征。<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
style='mso-bidi-font-size:10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>分布式数据库系统具有以下特点：<span
lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='mso-layout-grid-align:none;text-autospace:none'><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>1</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）数据的物理分布性；</span><span
lang=EN-US style='mso-bidi-font-size:10.5pt'>2</span><span style='mso-bidi-font-size:
10.5pt;font-family:宋体;mso-hansi-font-family:"Times New Roman"'>）数据的逻辑整体性；</span><span
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