diff --git a/P3/queries/query10.sql b/P3/queries/query10.sql
index 85205c5..474fc44 100644
--- a/P3/queries/query10.sql
+++ b/P3/queries/query10.sql
@@ -4,7 +4,7 @@
 -- Expected Heading: RELATION {province CHARACTER, country CHARACTER, qty_last10 INTEGER, qty_1020 INTEGER}
 -- How do you treat the default case as showed in the instructions?
 
-SELECT province.name AS province, country.name AS country, qty_last10, (qty_last20-qty_last10) AS qty_1020
+SELECT province.name AS province, country.name AS country, qty_last10, qty_1020
 FROM (
 	SELECT province, SUM(qty) as qty_last10
 	FROM Purchases
@@ -12,13 +12,13 @@ FROM (
 	GROUP BY province
 ) AS L
 JOIN (
-	SELECT province, SUM(qty) as qty_last20
+	SELECT province, SUM(qty) as qty_1020
 	FROM Purchases
-	WHERE time > date((SELECT MAX(time) FROM Purchases),'-20 days')
+	WHERE time > date((SELECT MAX(time) FROM Purchases),'-20 days') AND time <= date((SELECT MAX(time) FROM Purchases),'-10 days')
 	GROUP BY province
 ) AS P ON L.province = P.province
 JOIN province ON L.province = province.ROWID
 JOIN country ON province.country = country.code
-ORDER BY (2*qty_last10-qty_last20) DESC
+ORDER BY qty_last10-qty_1020 DESC
 LIMIT 10
 ;