\subsubsection{Conclusion}
We can use all algorithms for equality joins (equi-joins), but if we have equalities over multiple attributes, then:
\begin{itemize}
    \item PNL, BNL: work the same
    \item INL, BINL: build indexes on one, or all attributes of the equality conditions
    \item SMJ, HJ: Sort or hash on the combination of the attributes
\end{itemize}

For inequality joins:
\begin{itemize}
    \item PNL, BNL: work the same
    \item INL, BINL: need clustered B+ tree index
    \item SMJ, HJ: don't work at all
\end{itemize}