日期范围之间的总价（例如酒店预订季节）

Question

 id       carID     date1         date2      price
 ---      ----     ---------    ---------    -----
 1        1       1000-01-01    9999-12-31   100

 2        2       1000-01-01    2014-06-06   100 
 3        2       2014-06-07    2014-06-07   150
 4        2       2014-06-08    9999-12-31   100

 5        3       1000-01-01    2014-06-01   150
 6        3       2014-06-02    2014-07-01   200
 7        3       2014-07-02    2014-07-25   300
 8        3       2014-07-26    9999-12-31   100 

This is my price table; I want to calculate total price with my dates range.

I want to display all cars with total price;

for example my filter dates:

date1: 2014-06-01
date2: 2014-06-22

RESULTS

CARID    TOTAL
------ ------
1      2100
2      2150
3      4150

And I try this , but it is only for one carID.
calculate price between given dates
Also This;
calculate price between given dates in multiple ranges

Answer 1

Assuming you have variables @date1 and @date2 , you can do this with conditional aggregation:

select carid,
       sum(1 + greatest(least(date2, @date2) - greatest(date1, @date1), 0) * price)
from table t
group by carid;

This just replaces the boundaries of each period in the table with the intersection with the outer boundaries. It then sums up the duration times the price. The 1 + seems to handle the case that date2 appears to be a valid date for the price, rather then the first date when it is not active.