AdventureWorks Database: Find the statistical variance of the sales quota for each quarter
SQL Query - AdventureWorks: Exercise-108 with Solution
108. From the following table write a query in SQL to return the statistical variance of the sales quota values for a salesperson for each quarter in a calendar year. Return quotadate, quarter, SalesQuota, and statistical variance. Order the result set in ascending order on quarter.
Sample table: Sales.SalesPersonQuotaHistory
Sample Solution:
SELECT quotadate AS Year, date_part('quarter',quotadate) AS Quarter, SalesQuota AS SalesQuota,
var_pop(SalesQuota) OVER (ORDER BY date_part('year',quotadate), date_part('quarter',quotadate)) AS Variance
FROM sales.salespersonquotahistory
WHERE businessentityid = 277 AND date_part('year',quotadate) = 2012
ORDER BY date_part('quarter',quotadate);
Sample Output:
year |quarter|salesquota|variance | -----------------------+-------+----------+---------------------+ 2012-02-29 00:00:00.000| 1.0| 952000| 0| 2012-05-30 00:00:00.000| 2.0| 1600000|104976000000.00000000| 2012-08-30 00:00:00.000| 3.0| 1352000| 71267555555.55555556| 2012-11-30 00:00:00.000| 4.0| 839000| 93529187500.00000000|
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