SELECT * Hurts Performance, Badly
Quite a few years ago, I wrote a post about SELECT * and performance. That post had a bit of a click-bait title (freely admitted). I wrote the post...
2021-02-01 (first published: 2021-01-25)
701 reads
Daily Coping 25 Jan 2021
I started to add a daily coping tip to the SQLServerCentral newsletter and to the Community Circle, which is helping me deal with the issues in the world. I’m...
2021-01-25
32 reads
Upgrading Ola Hallengren’s Maintenance Solution with dbatools
While presenting Backup Basics with Powershell and dbatools at ONDT, I mentioned a caveat with the -ReplaceExisting switch for Install-DbaMaintenanceSolution. This switch drops all of the objects installed by...
2021-01-25
207 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
This Wednesday I have the pleasure to speak about Latches, Spinlocks, and Latch Free Data Structures at the EightKB Online Conference. This year they are expecting more than 1500 attendees and...
2021-01-25
11 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
6 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
6 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
6 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
7 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
12 reads
Speaking about Latches & Spinlocks at the EightKB Online Conference
(Be sure to checkout the FREE SQLpassion Performance Tuning Training Plan - you get a weekly email packed with all the essential knowledge you need to know about performance...
2021-01-25
11 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