AdventureWorks Database: Return the difference in sales quotas for a specific employee

SQL Query - AdventureWorks: Exercise-181 with Solution

181. From the following table write a query in SQL to return the difference in sales quotas for a specific employee over previous calendar quarters. Sort the results by salesperson with businessentity id 277 and quotadate year 2012 or 2013.

Sample table: sales.salespersonquotahistory

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Sample Solution:

SELECT quotadate AS Year, date_part('quarter',quotadate) AS Quarter, SalesQuota AS SalesQuota,  
       LAG(SalesQuota) OVER (ORDER BY date_part('year',quotadate), date_part('quarter',quotadate)) AS PrevQuota,  
       SalesQuota - LAG(SalesQuota) OVER (ORDER BY date_part('year',quotadate), date_part('quarter',quotadate)) AS Diff  
FROM sales.salespersonquotahistory  
WHERE businessentityid = 277 AND date_part('year',quotadate) IN (2012, 2013)  
ORDER BY date_part('year',quotadate), date_part('quarter',quotadate);

Sample Output:

year                   |quarter|salesquota|prevquota|diff   |
-----------------------+-------+----------+---------+-------+
2012-02-29 00:00:00.000|    1.0|    952000|         |       |
2012-05-30 00:00:00.000|    2.0|   1600000|   952000| 648000|
2012-08-30 00:00:00.000|    3.0|   1352000|  1600000|-248000|
2012-11-30 00:00:00.000|    4.0|    839000|  1352000|-513000|
2013-02-28 00:00:00.000|    1.0|   1369000|   839000| 530000|
2013-05-30 00:00:00.000|    2.0|   1171000|  1369000|-198000|
2013-08-30 00:00:00.000|    3.0|    971000|  1171000|-200000|
2013-11-30 00:00:00.000|    4.0|    714000|   971000|-257000|

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