SQL查询根据大小和类型的日期范围组计算2个单独的数据列

Question

I have 2 separate sql queries (shown below) that work well but I need to show the data in one table as begInv, acqQty, isize, type. How do I show the 2 columns together with separate date ranges in the same table for the given size and type?

SELECT 
      Sum(i.Qty) as begInv
      ,i.Size
      ,i.Type     
  FROM InvDetails i
  join Acquisition a
  on i.SerialNo = a.SerialNo
  where a.DtAcquired < '1/25/2014' 
  group by i.Size, i.Type

SELECT 
      Sum(i.Qty) as acqqty
      ,i.Size
      ,i.Type     
  FROM InvDetails i
  join Acquisition a
  on i.SerialNo = a.SerialNo
  where a.DtAcquired between '1/25/2014' and '3/15/2014'
  group by i.Size, i.Type

The data would look like that when combined: begInv acqqty Size Type 0 5 Pint ice cream 0 6 16 oz soda 1 8 gallon soda 3 46 5 oz. soda 0 15 50 ML soda 0 11 5 ML soda 0 9 7 Ounce cream 1 12 Pint cream 1 4 75 ML milk 1 6 Pint milk

Thanks!

Answer 1

You want to use conditional aggregation:

SELECT Sum(case when a.DtAcquired < '2014-01-25'
                then i.Qty
                else 0
           end) as begqty,
       Sum(case when a.DtAcquired between '2014-01-25' and '2014-03-15'
                then i.Qty
                else 0
           end) as acqqty,
       i.Size, i.Type     
FROM InvDetails i join
     Acquisition a
     on i.SerialNo = a.SerialNo
group by i.Size, i.Type;

Note that I changed the date formats to use ANSI standard format; this is a bit safer than the form you used (which can be ambiguous as to whether it is mmddyyyy or ddmmyyyy).