tsql - SQL how can i select data between dates? -


i have 2 tables

events

eventcode    eventdate 1            2013-07-22 04:00:00.000 2            2013-07-21 11:00:00.000 3            2013-07-21 10:00:00.000

devicesignal transaction table

 timestamp                   deviceid    value 2013-07-22 03:10:00.000     dev1             33 2013-07-22 03:00:00.000     dev2             22 2013-07-21 11:00:00.000     dev3             23 2013-07-21 10:50:00.000     dev4             45 2013-07-21 10:40:00.000     dev5             23 2013-07-21 10:30:00.000     dev1             54 2013-07-21 10:20:00.000     dev2             22 2013-07-21 09:50:00.000     dev1             11 2013-07-21 09:40:00.000     dev2             23

base on eventdate , timestamp , deviceid , value, timestamp in eventdate hierarchy , how can below output ?

 eventcode   eventdate               timestamp               deviceid    value 1           2013-07-22 04:00:00.000 2013-07-22 03:10:00.000  dev1       33 1           2013-07-22 04:00:00.000 2013-07-22 03:00:00.000  dev2       22 2           2013-07-21 11:00:00.000 2013-07-21 10:50:00.000  dev4       45 2           2013-07-21 11:00:00.000 2013-07-21 10:40:00.000  dev5       23 2           2013-07-21 11:00:00.000 2013-07-21 10:30:00.000  dev1       54 2           2013-07-21 11:00:00.000 2013-07-21 10:20:00.000  dev2       22 3           2013-07-21 10:00:00.000 2013-07-21 09:50:00.000  dev1       11 3           2013-07-21 10:00:00.000 2013-07-21 09:40:00.000  dev2       23 

select     e.eventcode, e.eventdate,     d.timestamp, d.deviceid, d.value      devicesignal d   outer apply     ( select top (1) e.eventcode, e.eventdate       events e       d.timestamp <= e.eventdate       order e.eventdate     ) e ;

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