Baseline SQL Server with SQL Sentry Performance Advisor
Baselines can be any set of metrics that have been recorded to give you an understanding of what is the...
2013-06-24
2,915 reads
SQL Server 365
Dedicated Administrator Connection (DAC)
We all dread the scenario whereby SQL Server is under so much load and has a complete lack of resources...
2013-05-29 (first published: 2013-05-23)
4,462 reads
Object Qualification
I came across an interesting issue recently with NHibernate, now it is widely known I despise ORM’s, in my experience...
2013-05-22 (first published: 2013-05-15)
2,769 reads
DTA and Hypothetical Indexes
For those of you that don’t know DTA stands for Database Engine Tuning Adviser and is available from the Tools...
2013-05-15 (first published: 2013-05-09)
11,491 reads
SQL Server Hardware and Acronyms
Over the weekend I finished reading yet another Red Gate book, this one was SQL Server Hardware by Glenn Berry...
2013-05-07
930 reads
Index Tuning
This week I've been carrying out some performance tuning of some of the more intensive procedures in one of our environments. Using...
2013-03-21 (first published: 2013-03-14)
3,638 reads
Cost Threshold for Parallelism
Parallelism, where to start? Well let’s start right at the beginning shall we with the question, what is parallelism? Simply...
2013-02-26
3,537 reads
Fun with dates
Every year me and a group of friends attend the Royal International Air Tattoo (RIAT) at RAF Fairford, for us it...
2013-02-17
798 reads
T-SQL Gotcha
I came across an interesting issue a few days ago that I thought I would blog about. The issue is...
2013-02-15
1,614 reads
Script Replication with PowerShell
I promised you some PowerShell scripts this year and this post is the first one. I can see the value...
2013-02-14
6,848 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...
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