Update page 'Useful SQL commands'

Useful-SQL-commands.md

@@ -5,4 +5,7 @@ Get the maximum entered sub-title rank:
 * 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)
+* SELECT * FROM gwsubtitles WHERE titlenameid = 25 AND stnameid IN (4, 6, 9); (4 6 9 will be replaced by a ? mark)
+
+Delete title ranks from an array:
+* DELETE FROM gwsubtitles WHERE titlenameid = 54 AND stnameid IN (160,161,162);