Hello, Is there an easy way to get the last timestamped record not later than a given date/time?
I record data for a scientific application and I do not sample my data at a given, fixed frequency. Instead, whenever a physical value changes beyond a given threshold, I get a new timestamped value which is stored in the database. For data analysis however it is more convenient to have a regularly-spaced timeseries of that data. For instance, if I get temperature measurements at 7:56, 8:02, 8:13 and 8:27, and would like a timeseries 15-minutes apart (8:00, 8:15, 8:30), I would like MySQL to automatically figure out that I need the measurements from 7:56, 8:13 and 8:27. Any simple way to do that would be immensely appreciated. Thanks in advance, -- -------------------------------------------------- David Lindelöf Station 18 LESO-PB/EPFL 1015 Lausanne tel +41-21-693.5556 mob +41-79-415.6641 fax +41-21-693.2722 e-mail [EMAIL PROTECTED] url http://lesowww.epfl.ch/doctorants/lindelof/ weblog http://visnet.ch/~lindelof/smartbuildings/ -------------------------------------------------- "We came. We saw. We kicked its ass." -- Bill Murray, _Ghostbusters_ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
