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AdventureWorks Database: Find the sales quota difference between the current and the first and last quarter

SQL Query - AdventureWorks: Exercise-107 with Solution

107. From the following table write a query in SQL to compute the difference between the sales quota value for the current quarter and the first and last quarter of the year respectively for a given number of employees. Return BusinessEntityID, quarter, year, differences between current quarter and first and last quarter. Sort the result set on BusinessEntityID, SalesYear, and Quarter in ascending order.

Sample table: Sales.SalesPersonQuotaHistory


Click to view Full table

Sample Solution:

SELECT BusinessEntityID
    , DATE_PART('quarter', QuotaDate) AS Quarter
    , date_part('year',QuotaDate) AS SalesYear
    , SalesQuota AS QuotaThisQuarter
    , SalesQuota - FIRST_VALUE(SalesQuota)
          OVER (PARTITION BY BusinessEntityID, date_part('year',QuotaDate)
              ORDER BY DATE_PART('quarter', QuotaDate)) AS DifferenceFromFirstQuarter
    , SalesQuota - LAST_VALUE(SalesQuota)
          OVER (PARTITION BY BusinessEntityID, date_part('year',QuotaDate)
              ORDER BY DATE_PART('quarter', QuotaDate)
              RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS DifferenceFromLastQuarter
FROM Sales.SalesPersonQuotaHistory
WHERE date_part('year',QuotaDate) > 2005 AND BusinessEntityID BETWEEN 274 AND 275
ORDER BY BusinessEntityID, SalesYear, Quarter;

Sample Output:

businessentityid|quarter|salesyear|quotathisquarter|differencefromfirstquarter|differencefromlastquarter|
----------------+-------+---------+----------------+--------------------------+-------------------------+
             274|    2.0|   2011.0|           28000|                         0|                   -63000|
             274|    3.0|   2011.0|            7000|                    -21000|                   -84000|
             274|    4.0|   2011.0|           91000|                     63000|                        0|
             274|    1.0|   2012.0|          140000|                         0|                    33000|
             274|    2.0|   2012.0|           70000|                    -70000|                   -37000|
             274|    3.0|   2012.0|          154000|                     14000|                    47000|
             274|    4.0|   2012.0|          107000|                    -33000|                        0|
             274|    1.0|   2013.0|           58000|                         0|                   -26000|
             274|    2.0|   2013.0|          263000|                    205000|                   179000|
             274|    3.0|   2013.0|          116000|                     58000|                    32000|
             274|    4.0|   2013.0|           84000|                     26000|                        0|
             274|    1.0|   2014.0|          187000|                         0|                        0|
             275|    2.0|   2011.0|          367000|                         0|                  -135000|
			 
...

SQL AdventureWorks Editor:

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SQL: Tips of the Day

Difference between natural join and inner join

One significant difference between INNER JOIN and NATURAL JOIN is the number of columns returned-

Consider:

TableA                           TableB
+------------+----------+        +--------------------+    
|Column1     | Column2  |        |Column1  |  Column3 |
+-----------------------+        +--------------------+
| 1          |  2       |        | 1       |   3      |
+------------+----------+        +---------+----------+

The INNER JOIN of TableA and TableB on Column1 will return

SELECT * FROM TableA AS a INNER JOIN TableB AS b USING (Column1);
SELECT * FROM TableA AS a INNER JOIN TableB AS b ON a.Column1 = b.Column1;

+------------+-----------+---------------------+    
| a.Column1  | a.Column2 | b.Column1| b.Column3|
+------------------------+---------------------+
| 1          |  2        | 1        |   3      |
+------------+-----------+----------+----------+

The NATURAL JOIN of TableA and TableB on Column1 will return:

SELECT * FROM TableA NATURAL JOIN TableB
+------------+----------+----------+    
|Column1     | Column2  | Column3  |
+-----------------------+----------+
| 1          |  2       |   3      |
+------------+----------+----------+

Ref: https://bit.ly/3AG5CId

 

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