AdventureWorks Database: Find the average and sum of the subtotal

SQL Query - AdventureWorks: Exercise-8 with Solution

8. From the following table write a query in SQL to find the average and the sum of the subtotal for every customer. Return customerid, average and sum of the subtotal. Grouped the result on customerid and salespersonid. Sort the result on customerid column in descending order.

Sample table: sales.salesorderheader

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Sample Solution:

SELECT customerid,salespersonid,AVG(subtotal) AS avg_subtotal,
SUM(subtotal) AS sum_subtotal 
FROM sales.salesorderheader 
GROUP BY customerid,salespersonid
ORDER BY customerid DESC;

Sample Output:

customerid|salespersonid|avg_subtotal          |sum_subtotal|
----------+-------------+----------------------+------------+
     30118|          275|    34638.152183333333| 207828.9131|
     30118|          277|    35369.828450000000|  70739.6569|
     30117|          275|    77171.792833333333| 463030.7570|
     30117|          277|    58954.136550000000| 353724.8193|
     30116|          276|    46778.550275000000| 187114.2011|
     30115|          289| 1114.6949250000000000|   8917.5594|
     30114|          290| 1456.6238875000000000|  11652.9911|
     30113|          282|    34148.236350000000| 273185.8908|
     30112|          280|    93591.621700000000|  93591.6217|
     30112|          284|    54909.378542857143| 384365.6498|
     30111|          277|    69131.600775000000| 276526.4031|
     30110|          276|  406.3188750000000000|   1625.2755|
     30109|          275|    59857.260500000000|  119714.521|
     30109|          277|    36114.523283333333| 216687.1397|
     30108|          289|    36150.645400000000| 144602.5816|
	 ...

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