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<body>
<div id="content" class="content">
<h1 class="title">Homework 4</h1>
<div id="table-of-contents" role="doc-toc">
<h2>Table of Contents</h2>
<div id="text-table-of-contents" role="doc-toc">
<ul>
<li><a href="#org9064b3f">1. Question One</a></li>
<li><a href="#orgb7b028b">2. Question Two</a></li>
<li><a href="#org9ad8b30">3. Question Three</a></li>
<li><a href="#org0b8ba7c">4. Question Four</a></li>
<li><a href="#orgc06dbaa">5. Question Five</a></li>
<li><a href="#org1205c21">6. Question Six</a></li>
<li><a href="#org01c7e07">7. Question Seven</a></li>
</ul>
</div>
</div>
<div id="outline-container-org9064b3f" class="outline-2">
<h2 id="org9064b3f"><span class="section-number-2">1.</span> Question One</h2>
<div class="outline-text-2" id="text-1">
<p>
The number of super keys here is the cardinality of the set of all sets of attributes that contain at least the clientId. In this case, that's:
</p>
<ol class="org-ol">
<li>(clientId)</li>
<li>(clientId, name)</li>
<li>(clientId, phone)</li>
<li>(clientId, address)</li>
<li>(clientId, name, phone)</li>
<li>(clientId, name, address)</li>
<li>(clientId, phone, address)</li>
<li>(clientId, name, phone, address)</li>
</ol>
<p>
Therefore there are eight super keys.
</p>
</div>
</div>
<div id="outline-container-orgb7b028b" class="outline-2">
<h2 id="orgb7b028b"><span class="section-number-2">2.</span> Question Two</h2>
<div class="outline-text-2" id="text-2">
<p>
There is only one primary key which is the collection of (clientId, empId, packageId).
</p>
</div>
</div>
<div id="outline-container-org9ad8b30" class="outline-2">
<h2 id="org9ad8b30"><span class="section-number-2">3.</span> Question Three</h2>
<div class="outline-text-2" id="text-3">
<p>
Salesman has two candidate keys empId and name, if we assume that each salesperson has a unique name. If not, then empId is the only candidate key (and also in this design, the primary key!).
</p>
</div>
</div>
<div id="outline-container-org0b8ba7c" class="outline-2">
<h2 id="org0b8ba7c"><span class="section-number-2">4.</span> Question Four</h2>
<div class="outline-text-2" id="text-4">
<div class="org-src-container">
<pre class="src src-sql">select clientId, name, phone, address from Client where name="Peter Smith";
</pre>
</div>
</div>
</div>
<div id="outline-container-orgc06dbaa" class="outline-2">
<h2 id="orgc06dbaa"><span class="section-number-2">5.</span> Question Five</h2>
<div class="outline-text-2" id="text-5">
<div class="org-src-container">
<pre class="src src-sql">select videoCode from Video where videoLength < 2;
</pre>
</div>
</div>
</div>
<div id="outline-container-org1205c21" class="outline-2">
<h2 id="org1205c21"><span class="section-number-2">6.</span> Question Six</h2>
<div class="outline-text-2" id="text-6">
<p>
Making the assumption that all addresses are formatted as "<street no> <street address>". For example "12345 John Blvd":
</p>
<div class="org-src-container">
<pre class="src src-sql">select siteCode, type, address, phone from Site where right(address, locate(' ', address)-1) = "University Dr";
</pre>
</div>
</div>
</div>
<div id="outline-container-org01c7e07" class="outline-2">
<h2 id="org01c7e07"><span class="section-number-2">7.</span> Question Seven</h2>
<div class="outline-text-2" id="text-7">
<p>
Assuming a siteCode of one:
</p>
<div class="org-src-container">
<pre class="src src-sql">select administrator.empId, administrator.name, administrator.gender from administers join administrator on administrator.empId=administers.empId where siteCode=1;
</pre>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Logan Hunt</p>
<p class="date">Created: 2022-10-08 Sat 18:41</p>
<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
</body>
</html>
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