T-SQL Documentation Generator
This post is a response to this month's T-SQL Tuesday #110 prompt by Garry Bargsley. T-SQL Tuesday is a way for the SQL Server community to share ideas about...
2019-01-08
11 reads
Bert Wagner
Visualizing Hash Match Join Internals And Understanding Their Implications
This post is part 3 in a series about physical join operators (be sure to check out part 1 – nested...
2019-01-10 (first published: 2019-01-02)
2,840 reads
Visualizing Hash Match Join Internals And Understanding Their Implications
This post is part 3 in a series about physical join operators (be sure to check out part 1 - nested loops joins, and part 2 - merge joins).
Watch...
2019-01-02
11 reads
Visualizing Hash Match Join Internals And Understanding Their Implications
This post is part 3 in a series about physical join operators (be sure to check out part 1 - nested loops joins, and part 2 - merge joins).
Watch...
2019-01-02
29 reads
2018 Community Influencer of the Year
A few days ago I was surprised to learn from Aaron Bertrand of SentryOne that he was selecting me as...
2019-01-01
1,007 reads
2018 Community Influencer of the Year
A few days ago I was surprised to learn from Aaron Bertrand of SentryOne that he was selecting me as Community Influencer of the Year for 2018.
Aaron states that...
2019-01-01
8 reads
2018 Community Influencer of the Year
A few days ago I was surprised to learn from Aaron Bertrand of SentryOne that he was selecting me as Community Influencer of the Year for 2018.
Aaron states that...
2019-01-01
10 reads
Visualizing Merge Join Internals And Understanding Their Implications
This post is part 2 in a series about physical join operators (be sure to check out part 1 – nested...
2018-12-31 (first published: 2018-12-18)
3,004 reads
Visualizing Merge Join Internals And Understanding Their Implications
This post is part 2 in a series about physical join operators (be sure to check out part 1 - nested loops joins, and part 3 - hash match...
2018-12-18
30 reads
Visualizing Merge Join Internals And Understanding Their Implications
This post is part 2 in a series about physical join operators (be sure to check out part 1 - nested loops joins, and part 3 - hash match...
2018-12-18
16 reads
Blogs
How to Clear the SSMS Cache (SSMS 21 and Later)
By SQLPals
How to Clear the SSMS Cache (SSMS 21 and Later) Updated...
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...
Forums
Let's Talk Certifications
Comments posted to this topic are about the item Let's Talk Certifications
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