How do we test ETL pipelines? Part one unit tests
Why do we bother testing? Testing isn’t an easy thing to define, we all know we should do it, when something goes wrong in production people shout and ask...
2019-07-25
58 reads
Redis University
As if I don’t have enough to do, I started a data structures class at Redis University. Someone recommended this to me as another way a company has structured...
2019-07-24
43 reads
Custom error messages
I’m sure lots of you have used the function RAISERROR to handle an error caused by your code. The problem ... Continue reading
2019-07-24
42 reads
Keep It Simple Stupid
Some of us take days and weeks to write a blog, while others can take two minutes and write a great blog *cough* *cough* Denny (B|T). Why is that?...
2019-07-24
38 reads
Weekly reading #22
A little bit late but it is here! It is Wednesday already and we are preparing for #DPS2019 which will be in August in Bangalore. Meanhwile I received another...
2019-07-24
27 reads
A simple powershell script to look up server hardware and OS information
This is a simple powershell script to query and display hardware and OS information from a remote computer.It uses CIM (Common Information Model) that is available since Powershell version...
2019-07-23
2,696 reads
Collecting Server Performance Metrics: Performance Monitor
Whether you’re a DBA/administrator looking to tune a server, planning for hardware updates, or looking to make a move to the cloud there are a few key performance metrics...
2019-07-23
147 reads
Introduction to SQL Server Execution Plans
Watch this week’s episode on YouTube! I nearly always use execution plans as the starting point for SQL query performance troubleshooting. In this multi-part series, I plan to review...
2019-07-23
211 reads
Introduction to SQL Server Execution Plans
Watch this week's video on YouTube
Part 1: Introduction to Execution Plans
Part 2: Overview of Statistics
Part 3: Reading an Execution Plan
Part 4: Commonly Troublesome Operators
Part 5: Troubleshooting Execution Plans
I nearly...
2019-07-23
21 reads
Introduction to SQL Server Execution Plans
Watch this week's video on YouTube
Part 1: Introduction to Execution Plans
Part 2: Overview of Statistics
Part 3: Reading an Execution Plan
Part 4: Commonly Troublesome Operators
Part 5: Troubleshooting Execution Plans
I nearly...
2019-07-23
9 reads
Blogs
My Social Media Rules
By Brian Kelley
I developed these rules a while back, before COVID. I had a period of...
Why Use TRY_PARSE(): #SQLNewBlogger
By Steve Jones
Someone asked why I would use TRY_PARSE after I posted a question at SQL...
A Guatemalan's Guide to Drinking Coffee Properly
My mugI grew up surrounded by coffee farms in Guatemala and somehow spent most...
Forums
Partitioning a table with TEXTIMAGE_ON option
I have a table that ends in ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]. I'm about to...
OUTER APPLY Fundamentals: Part 2
Comments posted to this topic are about the item OUTER APPLY Fundamentals: Part 2
Building Great Software
Comments posted to this topic are about the item Building Great Software
Question of the Day
The Range of Customers
I have this data in the OrderHeader table in a SQL Server 2025 database (ordered by CustomerID ASC):
orderid orderdate customerid complete 3 2025-05-10 00:00:00.0002 1 21 2024-01-10 00:00:00.0003 1 15 2023-10-28 00:00:00.0004 1 13 2025-03-08 00:00:00.0006 1 11 2024-04-02 00:00:00.0007 1If I run this query, how many rows are returned?
SELECT * from dbo.OrderHeader where customerid between 3 and '6'See possible answers