Query3 fix + query11/12

P3/queries/query11.sql

@@ -0,0 +1,21 @@
+DROP TABLE IF EXISTS ProductZeroPurchasesByProvince;
+
+CREATE TABLE ProductZeroPurchasesByProvince AS 
+SELECT 
+    c.name AS CountryName, 
+    pro.name AS ProvinceName, 
+    COUNT(pro.name) AS cnt
+FROM 
+    Purchases pur
+JOIN 
+    Province pro ON pur.product = 0 AND pur.province = pro.rowid 
+JOIN 
+    Country c ON pro.country = c.code
+GROUP BY 
+    c.code, pro.name;
+
+DROP INDEX IF EXISTS Province_index;
+CREATE INDEX Province_index ON Province(name,country)
+
+DROP INDEX IF EXISTS Country_index;
+CREATE INDEX Country_index ON Country(code)

P3/queries/query12.sql

@@ -0,0 +1,18 @@
+DROP TABLE IF EXISTS ProductZeroPurchasesByProvince;
+
+CREATE TABLE ProductZeroPurchasesByProvince AS 
+SELECT 
+    c.name AS CountryName, 
+    pro.name AS ProvinceName, 
+    COUNT(pro.name) AS cnt
+FROM 
+    Purchases pur
+JOIN 
+    Province pro ON pur.product = 0 AND pur.province = pro.rowid 
+JOIN 
+    Country c ON pro.country = c.code
+GROUP BY 
+    c.code, pro.name;
+
+DROP INDEX IF EXISTS Time_index;
+CREATE INDEX Time_index ON Purchases(time,province,product,qty);

P3/queries/query3.sql

@@ -4,39 +4,22 @@
 -- How do you treat the default case as showed in the instructions?
 -- How do you treat the case where several provinces of a same country have the same total number of purchases of product 0? You should show all such provinces.
 
-
-SELECT name AS country, province, abs, prop 
+SELECT 
+    ProductZeroPurchasesByProvince.CountryName AS country,
+    ProductZeroPurchasesByProvince.ProvinceName AS province,
+    MaxCount AS maximum,
+    CAST(MaxCount AS FLOAT) / TotalCount AS proportion
 FROM (
-	SELECT name AS province, country, max(cnt) as abs, max(cnt)*1.0/sum(cnt) AS prop
-	FROM(
-		SELECT province, sum(qty) as cnt
-		FROM Purchases
-		WHERE product = 0
-		GROUP BY province
-	)
-	JOIN Province ON province = Province.ROWID
-	GROUP BY country
-)
-JOIN Country ON country = code
-;
-
--- V2
-SELECT country.name, TMP.province, cnt AS abs, cnt*1.0/scnt AS prop
+    SELECT 
+        CountryName AS CountryMax,
+        MAX(cnt) AS MaxCount,
+        SUM(cnt) AS TotalCount
     FROM 
-(
-	SELECT province.country AS code, province.name AS province, COUNT(Purchases.qty) AS cnt
-	FROM province
-	LEFT JOIN Purchases ON Purchases.product = 0 AND Purchases.province = province.ROWID
-	GROUP BY province.name
-) AS TMP
-JOIN (
-	SELECT code, province, MAX(cnt) AS mcnt, SUM(cnt) AS scnt FROM (
-		SELECT province.country AS code, province.name AS province, COUNT(Purchases.qty) AS cnt
-		FROM province
-		LEFT JOIN Purchases ON Purchases.product = 0 AND Purchases.province = province.ROWID
-		GROUP BY province.name
-	)
-	GROUP BY code
-) AS F ON TMP.code = F.code AND TMP.cnt = F.mcnt
-JOIN country ON country.code = TMP.code
-;
+        ProductZeroPurchasesByProvince
+    GROUP BY 
+        CountryName
+) AS AggregatedData
+JOIN 
+    ProductZeroPurchasesByProvince ON AggregatedData.CountryMax = ProductZeroPurchasesByProvince.CountryName
+WHERE 
+    AggregatedData.MaxCount = ProductZeroPurchasesByProvince.cnt;