Carlos Robles

Carlos Robles is Microsoft Data Platform MVP also a very experienced multi platform DBA (MySQL, Oracle, SQL Server, SQL Azure) with over 10 years of experience in the database field.

He has worked in database support as a primary consultant and DBA manager for large national and international companies in the healthcare, finance and insurance, retail, food and energy industries.

International speaker, author, blogger, mentor, Guatemala SQL User group leader. If you don’t find him talking about geek stuff with his friends on twitter, it is very likely that he will be having a great time with his wife and daughter in the beautiful outdoors of Colorado.
  • Tagline: Just another witchcraft and wizardry site and DBA tips,
  • Interests: SQL Server, Linux, Databases
  • Blog: http://dbamastery.com

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Blog Post

Availability group error message 19405

Availability groups (AG’s) is one of my favorite features of SQL Server, despite some DBA’s catalogue them as “too complex” to implement, configure, manage  and maintain … I just...

2019-05-13 (first published: )

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Blogs

The flight recorder: Replaying what an AI agent did on my SQL Server

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“What exactly did it do on my server?” is the first question a DBA...

Announcements from the Microsoft Fabric Community Conference — Barcelona 2026

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Microsoft shared a broad set of Fabric, Power BI, and SQL updates at FabCon...

Au Revoir for now

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No, I’m not quitting or retiring. Just going on vacation, but I leave tonight...

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Forums

Let's Talk Certifications

By Grant Fritchey

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

By Pablo Echeverria

Comments posted to this topic are about the item The Hidden Security Risks of...

The Empty Aggregate

By Steve Jones - SSC Editor

Comments posted to this topic are about the item The Empty Aggregate

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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]
GO
What 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