Performance Comparison: Comparing Column Differences

Shane O’Neill has a column difference showdown:

The original post for this topic garnered the attention of a commenter who pointed out that the same result could be gathered using a couple of UNION ALLs and those lovely set-based EXCEPT and INTERSECT keywords.

I personally think that both options work and whatever you feel comfortable with, use that.

It did play on my mind though of what the performance differences would be…what would the difference in STATISTICS IO, TIME be? What would the difference in Execution Plans be? Would there even be any difference between the two or are they the same thing? How come it’s always the things I tell myself not to forget that I end up forgetting?

This may not be the most important thing to test, but it does show you a technique.

Related Posts

Notifications when Admins Connect to a SQL Server

Jon Shaulis builds a logon trigger to notify when sysadmins log into his systems: I was helping someone set up some monitoring in their database and they were asking about being notified when someone with administrative privileges logs into SQL Server. While many of you know that I try to use the right tool for […]

Read More

Using Show-Command in Powershell

Kenneth Fisher walks through the Show-Command cmdlet in Powershell: Years ago I blogged about how I like to use the SSMS scripting feature to learn how to do things. Well now I’m starting to learn Powershell and it turns out there is a GUI here as well that will help me learn to script. At least […]

Read More

Categories

June 2017
MTWTFSS
« May Jul »
 1234
567891011
12131415161718
19202122232425
2627282930