mysql - Complex Two Table Join -


trying result set has 1 row per sensorrule row sensorrule.sensorid exists in sensordata.sensorid date(sensor.messagedate) = curdate() , time(sensordata.messagedate) => sensorrule.fromtime , time(sensordata.messagedate) => sensorrule.totime.

resulting set less number of rows in sensorrule if there no rows in sensordata current date (messagedate) time of messagedate between fromtime , totime.

sensorrule +-------------+--------------+------------+-------+--------------+ | sensorid    | fromtime     | totime     | msg   | name         | +-------------+--------------+------------+-------+--------------+ | 27460       | 5:00         | 11:00      | work  | bob          | | 27461       | 4:00         | 15:00      | not   | susan        | | 27460       | 7:30         | 12:00      | max   | rick         | +-------------+--------------+------------+-------+--------------|  sensordata +---------+---------------------+---------------+----------+ | room    | messagedate         | transactionid |  sensorid| +---------+---------------------+---------------+----------+ | bedroom | 2014-05-30 07:48:14 | 332243181     | 27460    | | bedroom | 2014-05-30 05:48:14 | 332243182     | 27464    | | bedroom | 2014-05-22 07:36:21 | 332243183     | 27460    | | bedroom | 2014-05-22 09:23:21 | 332656534     | 27464    | | bedroom | 2014-05-21 06:34:22 | 332243185     | 27461    | | bedroom | 2014-05-20 06:15:06 | 332243187     | 27460    | | bedroom | 2014-05-20 07:40:34 | 332243172     | 27465    | | bedroom | 2014-05-19 09:27:56 | 332243191     | 27461    | | bedroom | 2014-05-18 06:34:08 | 332243101     | 27460    | +---------+---------------------+---------------+----------+

would resulting set like:

sensorid    msg     name     24760       work    bob  27461       not     susan

note: data set above doesn't yield above result

select distinct s.sensorid,s.msg,s.name sensorrule s,sensordata d s.sensorid=d.sensorid ,  time(d.messagedate)>s.fromtime ,  time(d.messagedate)<s.totime;

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