Create fix-product-name-format.sql

Author: kamyu104

MySQL/fix-product-name-format.sql

@@ -0,0 +1,9 @@
+# Time:  O(nlogn)
+# Space: O(n)
+
+SELECT LOWER(TRIM(product_name)) product_name,
+       substring(sale_date, 1, 7) sale_date,
+       count(sale_id) total
+FROM sales
+GROUP BY 1, 2
+ORDER BY 1, 2;