-- Database schema
| location : LocationID [ INTEGER ] primary_key , Country [ TEXT ] , State [ TEXT ] , StateCode [ TEXT ] , City [ TEXT ] | user : UserID [ TEXT ] primary_key , Gender [ TEXT ] | twitter : TweetID [ TEXT ] primary_key , Weekday [ TEXT ] , Hour [ INTEGER ] , Day [ INTEGER ] , Lang [ TEXT ] , IsReshare [ TEXT ] , Reach [ INTEGER ] , RetweetCount [ INTEGER ] , Likes [ INTEGER ] , Klout [ INTEGER ] , Sentiment [ REAL ] , text [ TEXT ] , LocationID [ INTEGER ] twitter.LocationID = location.LocationID , UserID [ TEXT ] twitter.UserID = user.UserID |
-- -- Among the tweets posted from Santa Fe state in Argentina, how many of them were posted on 31st?

SELECT COUNT(T1.TweetID) FROM twitter AS T1 INNER JOIN location AS T2 ON T1.LocationID = T2.LocationID WHERE T1.Day = 31 AND T2.State = 'Santa' AND T2.Country = 'Argentina';