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SQL Server 101 Tutorial

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Since its initial release in 1989, SQL Server has come a long way from its base functionality as an enterprise level database platform. While the core of SQL Server is still it's database engine, it is now so much more than just a relational database plat

2021-03-04

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Power Query or SQL Server? Which, when and why

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When it comes to developing a Power BI report, we can use it for accessing data, transforming the data, and turning the data into information using visuals. With no doubt Power BI can do the job from beginning to end. Now, this is not the only, nor necessarily the best, tool for all the steps […]

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2021-01-25

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The Empty Aggregate

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Question of the Day

The Empty Aggregate

I have this table in a SQL Server 2025 database:

CREATE TABLE [dbo].[CustomerOrder]
(
[OrderID] [int] NULL,
[CustomerID] [int] NULL,
[total] [money] NULL
) ON [PRIMARY]
GO
What is returned from this code? (answers are for the sum and then the count)
SELECT SUM(total) AS sum,
       COUNT(total) AS count
FROM dbo.CustomerOrder;



See possible answers