I just ran across this in a piece of code (that I didn’t write):
… WHERE Thing >GETDATE()- 30
Aaaand it works. If you run the title of this blog post, you’ll get the date 30 days ago. I had no idea you could do this…I’m very much used to using DateAdd() for all my date manipulation needs.
The equivalent DateAdd() syntax, btw, would be
… WHERE Thing > DATEADD(dd,-30,GETDATE())
In a search for “GetDate() – 30″, the first link to come up is a tek-tips.com forum conversation with Denny Cherry (web, Twitter):
dateadd would be a better way to handle this.
dateadd(dd, -30, getdate()). Check BOL for full syntax.
…there is little difference between them. However dateadd is a handy function to know in case he later wants to go back by months, or years when getdate()-x doesn’t work.
Well, that mostly answers that, then. Has anyone seen any performance issues or inconsistent behavior with this particular syntax? I don’t intend to switch, I’m just interested in the variation on the language.