\relax 
\bibstyle{plain}
\@writefile{toc}{\contentsline {paragraph}{Database query language.}{1}}
\@writefile{toc}{\contentsline {paragraph}{Relational Algebra.}{1}}
\@writefile{toc}{\contentsline {paragraph}{The operators of the relational algebra:}{1}}
\@writefile{toc}{\contentsline {paragraph}{Set operators}{1}}
\@writefile{toc}{\contentsline {paragraph}{Union ($\cup $):}{1}}
\@writefile{toc}{\contentsline {paragraph}{Set difference ($-$):}{1}}
\@writefile{toc}{\contentsline {paragraph}{Intersection ($\cap $)}{1}}
\@writefile{toc}{\contentsline {paragraph}{Note:}{1}}
\newlabel{e1}{{1}{1}}
\@writefile{toc}{\contentsline {paragraph}{Operators that remove part of the relation}{2}}
\@writefile{toc}{\contentsline {paragraph}{Projection ($\pi $)}{2}}
\@writefile{toc}{\contentsline {paragraph}{Selection ($\sigma $)}{2}}
\@writefile{toc}{\contentsline {paragraph}{Operators that combine relations}{2}}
\@writefile{toc}{\contentsline {paragraph}{Cartesian Product ($\times $)}{3}}
\newlabel{e2}{{2}{3}}
\@writefile{toc}{\contentsline {paragraph}{Join}{4}}
\newlabel{e3}{{3}{4}}
\@writefile{toc}{\contentsline {paragraph}{Special cases:}{4}}
\@writefile{toc}{\contentsline {paragraph}{Join is a derived operator}{4}}
\@writefile{toc}{\contentsline {paragraph}{Renaming ($\rho $):}{5}}
\newlabel{e4}{{4}{5}}
\@writefile{toc}{\contentsline {paragraph}{Outer-, Left Outer-, and Right Outer-join}{5}}
\newlabel{e5}{{5}{5}}
\@writefile{toc}{\contentsline {paragraph}{Division operator}{6}}
\newlabel{e5}{{6}{6}}
\@writefile{toc}{\contentsline {paragraph}{Combining Operations to Form Queries}{6}}
\@writefile{toc}{\contentsline {paragraph}{Simple SQL queries.}{7}}
\@writefile{toc}{\contentsline {paragraph}{What is important?}{7}}
\@writefile{toc}{\contentsline {paragraph}{Aggregations in SQL.}{7}}
\@writefile{toc}{\contentsline {paragraph}{What is important?}{7}}
\@writefile{toc}{\contentsline {paragraph}{General SQL queries.}{7}}
\@writefile{toc}{\contentsline {paragraph}{View.}{7}}
\@writefile{toc}{\contentsline {paragraph}{Modifying relation instance.}{8}}