Update laboratory2.sql

km52/Sielskyi_Yevhenii/laboratory2.sql

@@ -1,2 +1,51 @@
 -- LABORATORY WORK 2
 -- BY Sielskyi_Yevhenii
+/*---------------------------------------------------------------------------
+1. Вивести ключ покупця та ключ постачальника, за умови, що постачальник не продавав жодного продукту цьому покупцю.
+
+---------------------------------------------------------------------------*/
+--Код відповідь:
+
+SELECT DISTINCT CUSTOMERs.CUST_ID,
+        VENDORS.VEND_ID
+FROM CUSTOMERS FULL OUTER JOIN (
+    Select DISTINCT
+     CUSTOMERS.CUST_ID,
+     VENDORS.VEND_ID
+    FROM CUSTOMERS JOIN ORDERS
+           ON CUSTOMERS.CUST_ID = ORDERS.CUST_ID
+             JOIN ORDERITEMS
+           ON ORDERS.ORDER_NUM = ORDERITEMS.ORDER_NUM
+             JOIN PRODUCTS
+           ON ORDERITEMS.PROD_ID = PRODUCTS.PROD_ID
+             JOIN VENDORS
+           ON PRODUCTS.VEND_ID = VENDORS.VEND_ID) CUSTOMER_VENDOR 
+    ON CUSTOMERS.CUST_ID = CUSTOMER_VENDOR.CUST_ID
+        FULL OUTER JOIN VENDORS 
+    ON CUSTOMER_VENDOR.VEND_ID = VENDORS.VEND_ID
+    WHERE CUSTOMERS.CUST_ID is NULL OR
+        VENDORS.VEND_ID is NULL
+
+
+
+
+
+
+
+/*---------------------------------------------------------------------------
+2.  Вивести ключ покупця, що купляв по 4 різних товари в рамках одного замовлення.
+
+---------------------------------------------------------------------------*/
+
+--Код відповідь:
+SELECT *
+FROM (
+        Select Customers.CUST_ID,
+               COUNT(DISTINCT ORDERITEMS.PROD_ID) AS PROD_COUNT
+        From CUSTOMERS JOIN ORDERS
+            ON CUSTOMERS.CUST_ID = ORDERS.CUST_ID
+                JOIN ORDERITEMS
+            ON ORDERS.ORDER_NUM = ORDERITEMS.ORDER_NUM
+
+            GROUP BY CUSTOMERS.CUST_ID )
+WHERE PROD_COUNT = 4;