[DMDB] Notes, compile

2026-04-28 16:19:23 +02:00 · 2026-03-17 17:40:32 +01:00
parent b36cb31b75
commit f3e52702b2
3 changed files with 4 additions and 0 deletions
@@ -27,3 +27,6 @@ After \texttt{GROUP BY} we can't use \texttt{WHERE}, instead we can use \texttt{
 We can compare against a query with a single result column and row using a \texttt{WHERE} clause.

 The \texttt{CROSS JOIN} is the both-sided extension to \texttt{LEFT JOIN} and \texttt{RIGHT JOIN}
+
+We can compute the number of all passed grades for a person using something like
+\mint{sql}+SUM(CASE Grade >= 1 THEN 1 ELSE 0 END) AS PassedSubjectsCount+