From 6bf4b90c90f15f4ab60833bddf5b5756d1a6b1f6 Mon Sep 17 00:00:00 2001
From: Elizabeth Alexander Hunt <me@liz.coffee>
Date: Thu, 2 Jul 2026 11:55:17 -0700
Subject: Init

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+% Created 2022-10-31 Mon 14:58
+% Intended LaTeX compiler: pdflatex
+\documentclass[11pt]{article}
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{graphicx}
+\usepackage{longtable}
+\usepackage{wrapfig}
+\usepackage{rotating}
+\usepackage[normalem]{ulem}
+\usepackage{amsmath}
+\usepackage{amssymb}
+\usepackage{capt-of}
+\usepackage{hyperref}
+\author{Logan Hunt}
+\date{\today}
+\title{Homework 4}
+\hypersetup{
+ pdfauthor={Logan Hunt},
+ pdftitle={Homework 4},
+ pdfkeywords={},
+ pdfsubject={},
+ pdfcreator={Emacs 28.2.50 (Org mode 9.5.5)}, 
+ pdflang={English}}
+\begin{document}
+
+\maketitle
+\tableofcontents
+
+
+\section{Question One}
+\label{sec:org7142899}
+The number of super keys is the cardinality of the set of tuples of attributes that contain at least the clientId. In this case, that is:
+
+\begin{enumerate}
+\item \texttt{(clientId)}
+\item \texttt{(clientId, name)}
+\item \texttt{(clientId, phone)}
+\item \texttt{(clientId, address)}
+\item \texttt{(clientId, name, phone)}
+\item \texttt{(clientId, name, address)}
+\item \texttt{(clientId, phone, address)}
+\item \texttt{(clientId, name, phone, address)}
+\end{enumerate}
+
+Therefore there are eight super keys.
+
+\section{Question Two}
+\label{sec:org808ee68}
+There is only one primary key which is \texttt{(clientId, empId, packageId)}.
+
+\section{Question Three}
+\label{sec:orgdde212d}
+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 (therefore, the primary key!).
+
+\section{Question Four}
+\label{sec:org9bc5fbb}
+\begin{verbatim}
+select clientId, name, phone, address from Client where name="Peter Smith";
+\end{verbatim}
+
+\section{Question Five}
+\label{sec:orgaaa81c5}
+\begin{verbatim}
+select videoCode from Video where videoLength < 2;
+\end{verbatim}
+
+\section{Question Six}
+\label{sec:org55e6ae2}
+Making the assumption that all addresses are formatted as "<street no> <street address>". For example "12345 John Blvd":
+
+\begin{verbatim}
+select siteCode, type, address, phone from Site where right(address, locate(' ', address)-1) = "University Dr";
+\end{verbatim}
+
+\section{Question Seven}
+\label{sec:orgd1dc577}
+\begin{verbatim}
+select administrator.empId, administrator.name, administrator.gender from administers
+       join administrator on administrator.empId=administers.empId
+       where siteCode=111;
+\end{verbatim}
+
+\section{Question Eight}
+\label{sec:orgbaea177}
+\begin{verbatim}
+select salesman.empId, client.clientId, client.name, client.phone from client
+       join purchases on purchases.clientId = client.clientId
+       join salesman on salesman.empId = purchases.empId
+       where salesman.name="John";
+\end{verbatim}
+
+\section{Question Nine}
+\label{sec:org67a8ee6}
+\begin{verbatim}
+select digital_display.serialNo from digital_display
+       join locates on locates.serialNo=digital_display.serialNo
+       join site on site.siteCode=locates.siteCode
+       where site.siteCode = 112;
+\end{verbatim}
+
+\section{Question Ten}
+\label{sec:org3aed2a8}
+\begin{verbatim}
+select distinct(digital_display.schedulerSystem) from digital_display
+       join locates on locates.serialNo=digital_display.serialNo
+       join site on site.siteCode=locates.siteCode
+       where site.siteCode = 112;
+\end{verbatim}
+
+\section{Question Eleven}
+\label{sec:org8771b4d}
+\begin{verbatim}
+select * from model where screenSize > 10 and weight < 3
+\end{verbatim}
+
+\section{Question Twelve}
+\label{sec:org90164e0}
+\begin{verbatim}
+select digital_display.serialNo, digitial_display.modelNo, digitial_display.schedulerSystem from digitial_display
+       join locates on locates.serialNo=digital_display.serialNo
+       join site on site.siteCode=locates.siteCode
+       where site.type="bar";
+\end{verbatim}
+
+\section{Question Thirteen}
+\label{sec:org522e64a}
+\#+BEGIN\textsubscript{SRC} sql
+select empId, day from adm\textsubscript{work}\textsubscript{hours} where hours > 8;
+\#+END\textsubscript{SRC} sql
+\end{document}
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