On Thu, Dec 18, 2003 at 12:21:35 +0000, teknokrat <[EMAIL PROTECTED]> wrote: > I am after an sql query that can give the differnces between consecutive > timestamp values in the resultset. > anyone know how to do this?
I think you can do something like the following (untested) on most systems. select a.stamp - (select max(stamp) from tablename where tablename.stamp < a.stamp) from tablename; For postgres this (also untested) might be faster if there is an index on stamp. select a.stamp - (select stamp from tablename where tablename.stamp < a.stamp order by stamp desc limit 1) from tablename; The above relies on timestamps being unique. The difference for the smallest timestamp will be null. ---------------------------(end of broadcast)--------------------------- TIP 8: explain analyze is your friend
