update sql functions slides

Author: widnig89

slides/content/slides/Informatik/Database/10_sql-functions.md

@@ -52,6 +52,16 @@ FROM Employee;
 | David  | 5          |
 
 
+---
+
+# Rechnen
+
+```sql
+SELECT OrderItem, PricePerUnit, Quantity, PricePerUnit * Quantity AS Price
+FROM OrderItems;
+
+```
+
 ---
 
 # Grundlegende Aggregatfunktionen
@@ -74,18 +84,6 @@ FROM Products;
 
 # Kombinieren von Funktionen
 
-```sql
-SELECT OrderItem, PricePerUnit, Quantity, PricePerUnit * Quantity AS Price
-FROM OrderItems;
-
-```
-
-<br>
-
-oder
-
-<br>
-
 ```sql
 SELECT SUM(Column1) + SUM(Column2) AS TotalSum
 FROM TableX;