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--- modul:m290:learningunits:lu04:loesungen:l04 [2024/09/04 15:34] – angelegt vdemir
+++ modul:m290:learningunits:lu04:loesungen:l04 [2024/09/27 13:11] (aktuell) – gelöscht vdemir
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-====== LU04.S04 - SQL-DQL: Selects with Aggregate Functions ======
-===== Assignments =====
-The general assignment is to develop DQL commands that matches the requirements below:
-==== Assignment a: MIN ====
-We want to know which of our products is actually the most expensive.
-  SELECT max(price)
-  FROM Products;
-==== Assignment b: MAX ====
-What is the lowest price for the products of the supplier with id = 12?
-  SELECT max(price)
-  FROM Products
-  WHERE SupplierID = 12;
-==== Assignment c: AVG ====
-What is the average price for products of supplier 3?
-  SELECT AVG(price)
-  FROM Products
-  WHERE SupplierID = 3;
-==== Assignment d: AVG ====
-How many orders do we currently have in our data-base system from the customer with id = 5?
-  SELECT count(customerID)
-  FROM Orders
-  where customerID = 5;
-==== Assignment e: SUM ====
-What is the worth of the order 10255? Please note, that there are two tables involved in this select statement.
-  SELECT sum(price*quantity)
-  FROM OrderDetails, Products
-  WHERE orderDetails.OrderID = 10255
-  AND OrderDetails.ProductID = Products.ProductID;
-==== Assignment f: GROUP BY ====
-For our anual report we need list of the orders, and the value of each, grouped by the OrderID.
-  SELECT sum(price*quantity)
-  FROM OrderDetails, Products
-  WHERE orderDetails.OrderID = 10255
-  AND OrderDetails.ProductID = Products.ProductID;
-===== Vocabulary =====
-^ English ^ German ^
-| ... | ...|
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-[[https://creativecommons.org/licenses/by-nc-sa/4.0/|{{https://i.creativecommons.org/l/by-nc-sa/4.0/88x31.png}}]] Volkan Demir