How many times did the matches were held in MA Chidambaram Stadium from 5/9/2009 to 8/8/2011?
MA Chidambaram Stadium refers to Venue_Name = 'MA Chidambaram Stadium' ; from 5/9/2009 to 8/8/2011 refers to Match_Date between '2009-05-09' and '2011-08-08'
SELECT SUM(CASE WHEN Venue_Name = 'MA Chidambaram Stadium' THEN 1 ELSE 0 END) FROM `Match` AS T1 INNER JOIN Venue AS T2 ON T1.Venue_Id = T2.Venue_Id WHERE Match_Date BETWEEN '2009-05-09' AND '2011-08-08'