Update page 'Useful SQL commands'

Useful-SQL-commands.md

@@ -2,4 +2,7 @@ View which titles have at least 1 rank applied to it:
 * SELECT gwtitles.titlename FROM gwtitles WHERE titlenameid IN (SELECT titlenameid FROM gwsubtitles) ORDER BY titlename ASC;
 
 Get the maximum entered sub-title rank:
-* SELECT MAX(strank) FROM gwsubtitles WHERE titlenameid = ?;
+* SELECT MAX(strank) FROM gwsubtitles WHERE titlenameid = ?;
+
+Select title ranks from an array:
+* SELECT * FROM gwsubtitles WHERE titlenameid = 25 AND stnameid IN (4, 6, 9); (4 6 9 will be replaced by a ? mark)