====== LU05.A03 - SQL-DQL: Selects with Aggregate Functions ======

===== Requirements  =====
  * Work type: individual
  * Timeframe: 30 Minutes
  * Means of aid: 
      * only teaching materials, no websearch, no use of ai.
      * [[https://www.w3schools.com/sql/trysql.asp?filename=trysql_select_columns | W3Schools | SQL Editor]]
  * Expected result: Semantically and syntactically correct SQL statements according to the requirements of the case studies. 

===== Case studies / Assignments =====
The following ERD describes a order database for a a shop. 

===== Assignments =====
The general assignment is to develop DQL commands that matches the requirements below:

==== A: MIN ====
We want to know which of our products actually the cheapest is.

==== B: MAX ====
What is the highest price for the products of the supplier with id = 12?

==== C: AVG ====
What is the average price for products of supplier 3?

==== D: COUNT ====
How many orders do we currently have in our data-base system from the customer with id = 5?
  
==== E: SUM ====
What is the worth of the order 10255? Please note, that there are two tables involved in this select statement.

==== F: GROUP BY ====
For our anual report we need list of the orders, and the value of each, grouped by the OrderID.

===== Solution =====
[[modul:m290:learningunits:lu04:loesungen:l03|Lösung]]
  
===== Vocabulary =====
^ English ^ German ^ 
| ... | ...|


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