🟡 Solve problem 1070

Author: AF2B

sql/1070.sql

@@ -0,0 +1,21 @@
+WITH FirstYearSales AS (
+    SELECT 
+        product_id, 
+        MIN(year) AS first_year
+    FROM 
+        Sales
+    GROUP BY 
+        product_id
+)
+SELECT 
+    s.product_id, 
+    f.first_year, 
+    s.quantity, 
+    s.price
+FROM 
+    Sales s
+JOIN 
+    FirstYearSales f
+ON 
+    s.product_id = f.product_id 
+    AND s.year = f.first_year;