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All the Perl that's Practical to Extract and Report

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  • 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 []. Looks nice and tidy too.

    • 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.