答案1
使用线:
\documentclass{article}
\usepackage{array, hhline}
\renewcommand{\arraystretch}{1.2}
\setlength{\extrarowheight}{2pt}
\begin{document}
\begin{tabular}{|l|l|l|}
\hline
employee_id (PK)& name & ... \\
\hhline{|=|-|-|}
&&\\
\hline
&&\\
\hline
\end{tabular}
\end{document}