<p class="MsoNormal" style="text-indent: -18pt; margin: 0cm 0cm 0pt 18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">1.</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">下列哪一个不属于关系数据库的特点？</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">a)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">数据冗余度小</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">b)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">数据独立性高</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">c)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-size: small;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">数据共享性好</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">d)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;"><span style="font-size: small;">多用户访问</span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;"></span></p> <p><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"> <p class="MsoNormal" style="text-indent: -18pt; margin: 0cm 0cm 0pt 18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">2.</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-size: small;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="mso-spacerun: yes;">&nbsp;</span>SQL</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">中，下列涉及</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">NULL</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">的操作，哪个不正确？</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">a)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="font-size: small;">AGE IS NULL</span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">b)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="font-size: small;">AGE IS NOT NULL</span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">c)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="font-size: small;">AGE = NULL</span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;"><span style="font-size: small;">d)</span><span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="font-size: small;">NOT(AGE IS NULL)</span></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></p> </span></p> <p><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"><span style="font-size: small;"> <p class="MsoNormal" style="text-indent: -18pt; margin: 0cm 0cm 0pt 18pt; mso-list: l0 level1 lfo1; tab-stops: list 18.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;">3.<span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">关系模式</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">R</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">中若没有非主属性，那么</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US"></span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;">a)<span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">R</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">2NF</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">但不一定属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">3NF</span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;">b)<span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">R</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">3NF</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">但不一定属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">BCNF</span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;">c)<span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">R</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">BCNF</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">但不一定属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">4NF</span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;"><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-fareast-font-family: Arial;" lang="EN-US"><span style="mso-list: Ignore;">d)<span style="font: 7pt &quot;Times New Roman&quot;;">&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">R</span><span style="font-family: 宋体; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt; mso-ascii-font-family: Arial; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;">属于</span><span style="font-family: Arial; letter-spacing: 0.4pt; color: black; mso-bidi-font-size: 10.5pt;" lang="EN-US">4NF</span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;">&nbsp;</p> </span> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;">&nbsp;</p> </span></p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;">&nbsp;</p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;">&nbsp;</p> <p> <p class="MsoNormal" style="text-indent: -21pt; margin: 0cm 0cm 0pt 42pt; mso-list: l0 level2 lfo1; tab-stops: list 42.0pt;">&nbsp;</p> </p>