[DMDB] Fix error, add short remark on projections

2026-09-10 19:15:25 +02:00 · 2026-08-15 17:03:56 +02:00
parent 5de6b376ae
commit 3907316926
4 changed files with 3 additions and 2 deletions
@@ -24,6 +24,7 @@ Given $B$ frames of memory and $N$ records, we have (typically I/Os in pages to


 \subsubsection{Projection}
+Remember that we need the sort-based and bash-based approach to eliminate duplicates.
 \begin{itemize}
    \item \bi{Partitioning}: $\texttt{Cost}_\texttt{part}(R) = \texttt{cnt}(R) + \texttt{cnt}(R')$ with
          $\texttt{cnt}(R') = \texttt{cnt}(R) Q$, with $Q$ the fraction of selected attributes divided by total attributes