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SELECT GetDate() – 30 AS [This actually works??];

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.

Denny

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.

Curiously,
Jen
http://www.MidnightDBA.com/Jen

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