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AdventureWorks Database: Empty group as one of the elements of a GROUPING SET

SQL Query - AdventureWorks: Exercise-15 with Solution

15. From the following table write a query in SQL to find the total quantity for each locationid and calculate the grand-total for all locations. Return locationid and total quantity. Group the results on locationid.

Sample table: production.productinventory


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Sample Solution:

SELECT locationid, SUM(quantity) AS TotalQuantity
FROM production.productinventory
GROUP BY GROUPING SETS ( locationid, () );

Sample Output:

locationid|totalquantity|
----------+-------------+
          |       335974|
         4|          110|
        30|          958|
        50|        95477|
        40|          508|
        60|        20419|
         3|          186|
        20|         5165|
         7|        17319|
        10|        13584|
         1|        72899|
        45|          332|
         5|        20295|
         2|         5549|
         6|        83173|
		...

SQL AdventureWorks Editor:

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SQL: Tips of the Day

T-SQL Cast versus Convert?

CONVERT is SQL Server specific, CAST is ANSI.

CONVERT is more flexible in that you can format dates etc. Other than that, they are pretty much the same. If you don't care about the extended features, use CAST.

Ref : https://bit.ly/3VKT5M8