Duplicate & Overlapping Indexes can be a drag on write speed and disk resources. How do we find and eliminate them quickly and effectively?
2016-07-08 (first published: 2014-06-16)
46,318 reads
What are natively compiled stored procedures? Why would we want to use them and what are the performance benefits of using them over classic disk-based stored procedures?
2016-05-20 (first published: 2014-08-04)
25,008 reads
Have you ever wanted to run a query across every database on a server with the convenience of a stored procedure? If so, Microsoft provided a stored procedure to do so. It’s unreliable, outdated, and somewhat obfuscated, though. Let’s improve on it!
2016-04-15 (first published: 2014-12-01)
17,026 reads
It sounds simple enough. Either your column will always have a value or it may not. Yet somehow such a seemingly simple decision can become a never-ending debate where database schema begins to resemble superstition and designing effective tables seems more contentious than you expected it to be.
2016-02-26 (first published: 2014-10-30)
27,375 reads
Cursors are considered by many to be the bane of good T-SQL. What are the best ways to avoid iterative T-SQL and to write queries that look and perform beautifully? This first part in an ongoing series of cursor-killing handles inter-row analysis.
2015-12-18 (first published: 2014-05-27)
22,688 reads
CONNECT ANY DATABASE is one of three new permissions in SQL Server 2014 that can be granted to server logins. What is this new permission good for and why would we ever want this?
2014-07-29
15,146 reads
SQL Server 2012 introduced columnstore indexes, which can immensely improve the performance of OLAP queries. How were they updated and improved in SQL Server 2014?
2014-07-24
8,396 reads
SQL Server 2014 has a number of new DMVs, and some changes from SQL Server 2012. What are the new views and changes, and how can be useful to you?
2014-07-08
4,674 reads
There were many new DMVs added in SQL Server 2012, and some that have changed since SQL Server 2008 R2. This is a brief overview of the biggest changes and what they mean to you!
2014-07-03
6,122 reads
Statistics keep track of our data and will tell SQL Server how to make the best optimization decisions. Knowing how they work can make understanding query and performance problems much easier!
2014-06-09
5,683 reads
By ReviewMyDB
Index maintenance has always meant nightly jobs and a window you have to defend....
I’m sure you’ve all heard the tale of Goldilocks and the Three Bears, but...
By Steve Jones
One of the things I’ve been requesting for a number of years is cost...
Comments posted to this topic are about the item SQL Art, Part 4: Happy...
Comments posted to this topic are about the item How We Handled a Vendor...
Comments posted to this topic are about the item Cognitive Coverage
I have this data in the dbo.Commission table in a SQL Server 2022 database.
salesperson commission Brian 12 Brian 16 Andy 7 Andy 14 Andy 21 Steve 20 Steve NULLAll the data is a varchar, and I decide to run this query to get the totals for each salesperson.
SELECT SalesPerson
, AVG(TRY_PARSE(Commission AS int)) AS TotalCommission
FROM commission
GROUP BY SalesPerson
GO
What average commission is calculated for Steve? See possible answers