Where should I clean my data?
As a follow-up to my blogs What product to use to transform my data? and Should I load structured data into my data lake?, I wanted to talk about where you...
2019-04-25
2,209 reads
Attending a climate protest for the first time
This is a blog devoted to databases, but for once I’m going to go off topic and talk about something I did at the weekend that I’ve never done...
2019-04-25
31 reads
What’s the Mashup Engine?
I was testing something the other day and ran sp_who2 on a test instance. I saw this in the program listing: I had never seen the Mashup Engine listed...
2019-04-24
26,010 reads
Join me for a PASS Summit Pre-Con
I am very excited to announce I will be delivering a pre-conference session on SQL Server Performance Tuning on November 5th at PASS Summit 2019. If you have ever...
2019-04-24
96 reads
Yes, pulling just the data you need is really important.
I was asked the other day why a customer was having performance issues on a table. A simple SELECT that ... Continue reading
2019-04-24
333 reads
Interview with Andre Melancia
This is my second interview! This time with Andre who is a cat lover and great speaker! Here you can find the interview!
2019-04-24
52 reads
Should release cadence be slowed if you don’t have database load testing?
I got a question recently about a panel discussion on Database Development Disasters at SQL in the City Streamed. I had framed a question as, “how fast should development...
2019-04-23
24 reads
CISA Accredited Trainer!
My certification came in! I’m now accredited to provide training for the Certified Information Systems Auditor (CISA) certification. It’s not the Microsoft Certified Trainer (MCT) accreditation I once had...
2019-04-23
42 reads
Correlated Subqueries vs Derived Tables
Correlated subqueries provide an intuitive syntax for writing queries that return related data. However, they often perform poorly due to needing to execute once for every value they join on....
2019-05-07 (first published: 2019-04-23)
1,744 reads
Correlated Subqueries vs Derived Tables
Watch this week's video on YouTube
Correlated subqueries provide an intuitive syntax for writing queries that return related data. However, they often perform poorly due to needing to execute once for...
2019-04-23
24 reads
Blogs
Announcements from the Microsoft Fabric Community Conference — Barcelona 2026
By James Serra
Microsoft shared a broad set of Fabric, Power BI, and SQL updates at FabCon...
Au Revoir for now
By Steve Jones
No, I’m not quitting or retiring. Just going on vacation, but I leave tonight...
Forums
Let's Talk Certifications
Comments posted to this topic are about the item Let's Talk Certifications, which is...
FARE LABS Pvt. Ltd. is a Proficiency testing laboratory located in India.
The top proficiency testing facility in India is Fare Labs. We employ particular metrics...
The Hidden Security Risks of Role Combination in SSAS Tabular
Comments posted to this topic are about the item The Hidden Security Risks of...
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] GOWhat 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