To err is human, or so the saying goes. Unfortunately, in the world of IT, innocuous mistakes made early on can lead to really daunting problems down the road. In this article, Rob Gravelle goes over a few of the most common DBA mistakes to avoid. Some of these relate specifically to MySQL, while others may be applicable to any RDBMS.
2016-11-14
4,315 reads
Exploring some differences between using cursors, local fast forward cursors and using set logic.
2016-11-11 (first published: 2015-02-03)
17,565 reads
It is a common problem with a web page that a form is too complex to fit easily on the page. You can, of course, rely on the scrollbar, but it soon becomes a daunting and erratic process for the poor user. Wizards, that allow you to guide the user through a process, are great but take time to set up. Is there a simple solution for those occasions where there is too much data-entry for a form but a full wizard seems like overkill?
2016-11-11
3,292 reads
With the data proliferation issues, a well-defined lifecycle for data retention is a growing demand.
2016-11-10
2,248 reads
Marcin Policht focuses on the specifics of using Azure Active Directory to authenticate to Azure SQL Database.
2016-11-10
5,620 reads
2016-11-09
109 reads
Though duplicate rows are bad practice, sometimes they're necessary for a short time. But how do you clean your tables when they're no longer needed? Sergey Gigoyan provides a few different solutions.
2016-11-09
3,155 reads
Tables used purely for reporting sometimes lack a unique identifier. Find out how to remove duplicates from such a table when data loads go bad.
2016-11-08
7,018 reads
So you’re hosting your SQL Server in the cloud, and you’ve noticed that when you’re running a backup or a DBCC CHECKDB, you suffer from extreme performance problems - what's going on? Brent Ozar explains.
2016-11-08
3,699 reads
On a not-so-busy day, I received an alert saying tempdb has grown to 90 percent of the drive size and there is only 10 percent space left on the drive. The server is a SQL Server 2014 instance and hosts AlwaysOn secondary databases.
2016-11-07
22,080 reads
By James Serra
Microsoft shared a broad set of Fabric, Power BI, and SQL updates at FabCon...
By Steve Jones
No, I’m not quitting or retiring. Just going on vacation, but I leave tonight...
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Comments posted to this topic are about the item 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