First Impressions
SELECT @@Version
Microsoft SQL Server “Denali” (CTP1) – 11.0.1103.9 (X64)
I’ve been playing with the CTP for a few days (with absolutely no...
2010-11-09
1,436 reads
SQL In The Wild
A Trio of Table Variables
So, it’s the second Tuesday of the month again, and it’s time for T-SQL Tuesday again. This month it’s hosted...
2010-10-12
1,275 reads
One wide index or multiple narrow indexes?
Or “If one index is good, surely many indexes (indexes? indices? indi?) will be better”
This is a question that comes...
2010-09-14
1,586 reads
Come and gone
Or “Plan cache monitoring – insert and remove”
Previously I took a look at the CacheHit and CacheMiss events to see how...
2010-08-31
1,822 reads
Hit and miss
Or “Monitoring plan cache usage”
For people interested in the details of how SQL is using and reusing execution plans, there...
2010-07-27
1,148 reads
Does a missing data file send a database suspect?
Short answer: No
I keep seeing this come up on various forums when people ask what makes a database go suspect...
2010-06-29
2,042 reads
DBA Hell
On the first day of DBA hell, the server gave to me
A database with damaged system tables and no good...
2010-06-15
969 reads
In, Exists and join – a roundup
Over the last several months I’ve had a look at IN, Exists, Join and their opposites to see how they...
2010-04-27
1,357 reads
Left outer join vs NOT EXISTS
And to wrap up the miniseries on IN, EXISTS and JOIN, a look at NOT EXISTS and LEFT OUTER JOIN...
2010-03-23
13,096 reads
The Root of all Evil
Or “Shot gun query tuning”
There have been a fair few forums questions in recent months asking for help in removing...
2010-03-11
456 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
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