sql server - Need help with SQL query -

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i have following data:

 transactiontype        lane      transactiondate ------------------------------------------------            sale          17  2011-07-21 06:15:34          signon          18  2011-07-21 07:00:00            sale          18  2011-07-21 07:06:43          signon          20  2011-07-21 08:01:12            sale          18  2011-07-21 07:30:00            sale          18  2011-07-21 08:30:00            sale          18  2011-07-21 09:30:50            sale          20  2011-07-21 10:15:34         signoff          18  2011-07-21 19:00:00         signoff          20  2011-07-21 19:10:52

i need following information:

  1. the count of lane lie between signon , signoff transaction types
  2. the total time each lane @ signon state, e.g. row lane number 18 12 hours, row lane 20 has time of 11 hours, 9 minutes , 40 seconds

this of it... including multiple sign in/out per lane , how many transactions within each login/out time period. once result, can query total counts of active lanes / sessions whatever roll-up values... such total times lane 18 signed in/out total sales transactions, or overall how many lanes open , accounted such sale activity.

since group on lane, signon/off, applied min() hours, minutes, seconds constant per each signon/off session.

select        prequery.lane,       prequery.signedon,       prequery.signedoff,       min( datediff(hour, prequery.signedon, prequery.signedoff )) hours,       min( datediff(minute, prequery.signedon, prequery.signedoff )) minutes,       min( datediff(second, prequery.signedon, prequery.signedoff )) seconds,       count(*) numofsales            ( select                t1.lane,               t1.transactiondate signedon,               min( t2.transactiondate ) signedoff                           trans1 t1                  left join trans1 t2                     on t1.lane = t2.lane                     , t2.transactiontype = "signoff"                     , t2.transactiondate > t1.transactiondate                            t1.transactiontype = "signon"             group                t1.lane,               t1.transactiondate ) prequery        left join trans1 t3           on prequery.lane = t3.lane          , t3.transactiontype = "sale"          , t3.transactiondate between prequery.signedon , prequery.signedoff    group        prequery.lane,       prequery.signedon,       prequery.signedoff

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