[DMDB] Fix errors

semester4/dmdb/parts/01_sql/03_query-language/05_views.tex

@@ -11,7 +11,7 @@ Usability is also often much better due to having less complex queries to write
 
 \shade{orange}{How a view is evaluated}
 This is quite simple in essence, the \texttt{VIEW}'s query is inserted into the query using the view.
-It then is then optimized as it normally would be, too. Of course, it is likely that more optimization can and has to be done on views.
+It is then optimized as it normally would be, too. Of course, it is likely that more optimization can and has to be done on views.
 
 
 \paragraph{Updatable Views}