How to calculate the total days for reservation in MySQL -

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i have table stores vehicles reservations each record have datefrom "the reservation start date" , dateto "the reservation end date"

i trying write query calculate total of day each vehicles booked , total of revenue each vehicles generates.

the business rule are following

  1. if datefrom , dateto in same day considered 1 days
  2. if reservation 2013-05-25 2013-06-06 then 7 days go month of may , 5 days go month of june here break down of logic
2013-05-25 - 2013-05-26 (may) 2013-05-26 - 2013-05-27 (may) 2013-05-27 - 2013-05-28 (may) 2013-05-28 - 2013-05-29 (may) 2013-05-29 - 2013-05-30 (may) 2013-05-30 - 2013-05-31 (may) 2013-05-31 - 2013-06-01 (**may**) 2013-06-01 - 2013-06-02 (june) 2013-06-02 - 2013-06-02 (june) 2013-06-03 - 2013-06-02 (june) 2013-06-04 - 2013-06-02 (june) 2013-06-05 - 2013-06-02 (june)

this example on how calculation should work.

for revenue suppose calculate average daily rent dividing total revenue total rented days multiplying daily average total day fits range

this current query not calculating today days correctly. in above example if assume total revenue whole reservation $1500 average daily rent $1500/12 = $125

so since range calculating "2013-06-01 00:00:00" "2013-06-16 23:59:59", vehicle should display total days 5 , total revenue $625. more, if range 2013-05-01 00:00:00 2013-05-31 23:59:59 same vehicle have total of 7 days , total revenue of $875

the following current query in trying calculate differences.

select rs.vehicle_id,     round(sum(           case         when (rs.datefrom between "2013-06-01 00:00:00" , "2013-06-16 23:59:59")         , (rs.dateto between "2013-06-01 00:00:00"  , "2013-06-16 23:59:59")         (rs.totalrent + rs.totaltax)          when rs.dateto between "2013-06-01 00:00:00"  , "2013-06-16 23:59:59"         , rs.datefrom < "2013-06-01 00:00:00"         ( ( (rs.totalrent + rs.totaltax) / case when datediff( rs.dateto,rs.datefrom) = 0 1 else datediff( rs.dateto,rs.datefrom) end) * (datediff(rs.dateto, "2013-06-01 00:00:00")) )          when rs.datefrom between "2013-06-01 00:00:00" , "2013-06-16 23:59:59"         , rs.dateto > "2013-06-16 23:59:59"         ( ( (rs.totalrent + rs.totaltax) / case when datediff( rs.dateto,rs.datefrom) = 0 1 else datediff( rs.dateto,rs.datefrom) end) * (datediff( "2013-06-16 23:59:59",rs.datefrom)+1) )          when rs.datefrom < "2013-06-01 00:00:00" , rs.dateto > "2013-06-16 23:59:59"         ( ( (rs.totalrent + rs.totaltax) / case when datediff( rs.dateto,rs.datefrom) = 0 1 else datediff( rs.dateto,rs.datefrom) end) * (datediff( "2013-06-16 23:59:59", "2013-06-01 00:00:00") +1) )          else 0 end    )) income,   sum(          case         when (rs.datefrom between "2013-06-01 00:00:00" , "2013-06-16 23:59:59")         , (rs.dateto between "2013-06-01 00:00:00"  , "2013-06-16 23:59:59")         case when datediff( rs.dateto,rs.datefrom) = 0 1 else datediff( rs.dateto,rs.datefrom) end          when rs.dateto between "2013-06-01 00:00:00"  , "2013-06-16 23:59:59"         , rs.datefrom < "2013-06-01 00:00:00"         case when datediff(rs.dateto, "2013-06-01 00:00:00") = 0 1 else (datediff(rs.dateto, "2013-06-01 00:00:00")) end          when rs.datefrom between "2013-06-01 00:00:00" , "2013-06-16 23:59:59"         , rs.dateto > "2013-06-16 23:59:59"         case when datediff( "2013-06-16 23:59:59",rs.datefrom) = 0 1 else (datediff( "2013-06-16 23:59:59",rs.datefrom))  end          when rs.datefrom < "2013-06-01 00:00:00" , rs.dateto > "2013-06-16 23:59:59"         datediff( "2013-06-16 23:59:59", "2013-06-01 00:00:00")+1           else 0 end    ) days        reservation rs rs.reservationstatus in (2,3) group rs.vehicle_id

the problem query not calculating total days correctly. can me please?

the following sample of code

http://sqlfiddle.com/#!2/f6cbc/3 testing data

there no overlap in intervals(i.e. car have logic ensure not reserved multiple times?

if looking entire history, can sum invidual lengths of each reservation. want per-month breakdown?

select sum( to_days(dateto)-to_days(datefrom) +1 ) sum_days_reserved table

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