[DMDB] Some remarks for SQL

2026-09-10 19:15:25 +02:00 · 2026-08-06 08:21:46 +02:00
parent 101d024733
commit feb8575972
6 changed files with 11 additions and 6 deletions
@@ -18,6 +18,7 @@ Using SQL, this is achieved using the \texttt{GROUP BY} clause.
 We specify the columns on which the grouping should occur.

 \hl{\textbf{\textit{IMPORTANT}}} We can only use aggregates and columns appearing in the \texttt{GROUP BY} clause in the \texttt{SELECT} clause.
+It is possible to specify multiple grouping columns, the aggregates are computed on the first

 Using a \texttt{JOIN} function, it is of course then possible to go back retrieve the other columns.