Blog Post

How do test the upstream data is good in an etl process (etl testing part 3)?

In the first two parts of this series (https://the.agilesql.club/2019/07/how-do-we-test-etl-pipelines-part-one-unit-tests/ and https://the.agilesql.club/2019/08/how-do-we-prove-our-etl-processes-are-correct-how-do-we-make-sure-upstream-changes-dont-break-our-processes-and-break-our-beautiful-data/), I talked about how to unit test your business logic and integration test your ETL infrastructure code. Having...

2019-09-30

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Blog Post

How do test the upstream data is good in an etl process (etl testing part 3)?

In the first two parts of this series (https://the.agilesql.club/2019/07/how-do-we-test-etl-pipelines-part-one-unit-tests/ and https://the.agilesql.club/2019/08/how-do-we-prove-our-etl-processes-are-correct-how-do-we-make-sure-upstream-changes-dont-break-our-processes-and-break-our-beautiful-data/), I talked about how to unit test your business logic and integration test your ETL infrastructure code. Having...

2019-09-30

40 reads

Blog Post

Pre-Con in Denver

As prep for our pre-con at the PASS Summit, Kendra and I are presenting a pre-con at the Denver SQL Saturday#908, on Friday, October 11, 2019. We’ll be talking...

2019-09-27

79 reads

Blog Post

HammerDB for Azure SQL DB

Bench marking your environment is an important step when introducing new hardware, which is accomplished by running a test workload against the hardware.    There are multiple ways to...

2019-10-03 (first published: )

786 reads

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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