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
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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SQL: Tips of the Day
How to avoid the "divide by zero" error in SQL?
Select Case when divisor=0 then null Else dividend / divisor End ,,,
OR:
Select dividend / NULLIF(divisor, 0) ...
Ref: https://bit.ly/3dLj7gS
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