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Calculating years (anniversaries) between dates in SQL More | Login | Reply

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Depends on your dialect (Score:2)

by VSarkiss (704) on 2007.03.30 8:53 (#54076) Journal

Date functions aren't really standard in SQL, so it's a question of what RDBMS you're using. For Sybase and SQL server, you could use datediff(yy, @date1, @date2).

Looks like you've got Oracle. In which case I think if you used months, you wouldn't have to worry about leap years:

months_between(date1, date2)/12

But I haven't tested that.
As usual, Ask Tom has a nice answer: an implementation of DateDiff in PL/SQL [oracle.com]. Looks nice and tidy too.

Reply to This
- Re: (Score:1)
  
  by grinder (1100)
  
  The trouble with months_between is that it doesn't return nice sharp integers, it returns floats. This always makes me wonder about things like whether 11.6 months round up to a year.
  
  One more damned thing to go wrong, and all that.

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