Create sales-analysis-ii.sql

Author: kamyu104

MySQL/sales-analysis-ii.sql

@@ -0,0 +1,13 @@
+# Time:  O(m + n)
+# Space: O(m + n)
+
+SELECT DISTINCT buyer_id 
+FROM   sales 
+       INNER JOIN product 
+         ON sales.product_id = product.product_id 
+WHERE  product.product_name = "s8" 
+       AND buyer_id NOT IN (SELECT DISTINCT buyer_id 
+                            FROM   sales 
+                                   INNER JOIN product 
+                                     ON sales.product_id = product.product_id 
+                            WHERE  product.product_name = "iphone");