Do You Have a SQL Server Estate?
At Redgate, we do a lot of research. Maybe not as much as Microsoft Research, but we are always trying...
2019-02-19
865 reads
Finding single use plans in the plan cache
A single use plan is an entry in the SQL Server plan cache that was only used once. When a...
2019-03-07 (first published: 2019-02-19)
3,946 reads
COUNT, DISTINCT, and NULLs
Watch this week’s episode on YouTube.
One thing I see fairly often (and am occasionally guilty of myself) is using COUNT(DISTINCT)...
2019-03-05 (first published: 2019-02-19)
3,643 reads
COUNT, DISTINCT, and NULLs
Watch this week's video on YouTube
One thing I see fairly often (and am occasionally guilty of myself) is using COUNT(DISTINCT) and DISTINCT interchangeably to get an idea of the...
2019-02-19
23 reads
COUNT, DISTINCT, and NULLs
Watch this week's video on YouTube
One thing I see fairly often (and am occasionally guilty of myself) is using COUNT(DISTINCT) and DISTINCT interchangeably to get an idea of the...
2019-02-19
27 reads
SQL Server, What's In My Buffer Cache?
When SQL Server reads pages it stores them in an area of memory called the buffer cache, things like memory...
2019-03-06 (first published: 2019-02-19)
2,319 reads
Interview with Uwe Ricken
I have just done my first interview! The very special guest was Uwe Ricken!
My idea for the interview was...
2019-02-19
123 reads
Speaking at SQLBits in March 2019
I’m super excited about the fact I’ll be speaking at SQLBits this year. It’s my first time as a speaker...
2019-02-18
125 reads
Upcoming SQLpassion Trainings
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the...
2019-02-18
132 reads
Installing Extensions to Azure Data Studio
If you’re even thinking about experimenting with, let alone actively using, Azure Data Studio, you need to plan on installing a few extensions. Buck Woody has a great list...
2019-02-18
12 reads
Blogs
The flight recorder: Replaying what an AI agent did on my SQL Server
By Arun Sirpal
“What exactly did it do on my server?” is the first question a DBA...
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...
The Hidden Security Risks of Role Combination in SSAS Tabular
Comments posted to this topic are about the item The Hidden Security Risks of...
The Empty Aggregate
Comments posted to this topic are about the item The Empty Aggregate
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