DBMS
\(
\newcommand{\ord}[1]{\mathcal{O}\left(#1\right)}
\newcommand{\abs}[1]{\lvert #1 \rvert}
\newcommand{\floor}[1]{\lfloor #1 \rfloor}
\newcommand{\ceil}[1]{\lceil #1 \rceil}
\newcommand{\opord}{\operatorname{\mathcal{O}}}
\newcommand{\argmax}{\operatorname{arg\,max}}
\newcommand{\str}[1]{\texttt{"#1"}}
\)