Stocktaking Table
 StoreID      Date    ProductCode      Qty
    1     2016-07-30    11             58
    1     2016-09-30    11             97
    2     2016-08-30    12             15
    2     2016-09-22    55             10
    3     2016-09-05    55             10


   Sale Table
  StoreID   Date    ProductCode Qty
    1      2016-08-30   11      40
    2     2016-08-30    12      3
    2     2016-08-30    55      4
    3     2016-08-30    55      6

Desired Output


   StoreID  Date    Productcode Qty
    1      2016-08-30   11      18
    2      2016-08-30   12      12
    2     2016-08-30    55      6
    3      2016-08-30   55      4

@ date1 and @date2 @storeid

StoreID    Date    Productcode Qty
    1   2016-08-30     11       18
    2   2016-08-30     12       12
    2   2016-08-30     55       -4
    3   2016-08-30     55       -6