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Producing Monthly Totals with SQL

I've never tried this with SQL, but I'm sure it's possible.
I have data prepared nicely with the following self-explanatory fields:

ID, DAILY_AMOUNT, TERM_START, TERM_END

I want to turn this into a report that yields total DAILY_AMOUNT where the selection criteria specify a start and end date.
So, for example, this could be used to answer the question, "How much did I spend on widgets in July of 2010?".
So If I spent $5 every day on widgets from, say, 2010/6/12 to 2010/7/5, the answer would be $25 ($5 x 5 Days in July).

What's the smart way to do this?

Mike
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shacho
Asked:
shacho
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1 Solution
 
jogosCommented:
select year(TERM_END),month(TERM_END), sum(DAILY_AMOUNT)
from tabelname
where TERM_END between   .. and ..
group by year(TERM_END),month(TERM_END)
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shachoAuthor Commented:
That would work if I had individual records for each day.  I don't I only have the "daily amount".  So I need to calculate how many days the expense term and the extraction term have in common.  If I have that number, I can multiply by the daily amount to get the sum.
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AnuTijiCommented:
Hi

Please find the TSQL statement below:

DECLARE @TERM_STARTDATE datetime
DECLARE @TERM_ENDDATE datetime

SET @TERM_STARTDATE  = '05/05/2010' (Input: Start date of the period)
SET @TERM_ENDDATE ='05/08/2010' (Input: End date of the period)

SELECT sum(ISNULL(DAILY_AMOUNT,0) * DATEDIFF(day,TERM_START, TERM_END)) as amount FROM table_name WHERE DATEDIFF(day,@TERM_STARTDATE, TERM_START) >=0  AND DATEDIFF(day,@TERM_ENDDATE, TERM_END) <=0  
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shachoAuthor Commented:
I can't quite see how that would work.  There are several scenarios that need to be considered, e.g. ranges that don't overlap, partially overlap, are sub or super sets of each other, etc.  This is how I do it (in Access with VBA) right now.  This may clarify what the actual data look like.  This is a fine solution, but SQL would be much faster.

Public Function OverLap(TermStart As Date, TermEnd As Date, RangeStart As Date, RangeEnd As Date) As Integer
    Dim StartDate As Date, EndDate As Date
    OverLap = 0
    If TermEnd < RangeStart Then Exit Function
    If TermStart > RangeEnd Then Exit Function
    If RangeEnd < TermEnd Then EndDate = RangeEnd Else EndDate = TermEnd
    If RangeStart > TermStart Then StartDate = RangeStart Else StartDate = TermStart
    OverLap = EndDate - StartDate + 1
End Function
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AnuTijiCommented:
hi

I believe the above conditions are satisfied by sql query pasted below. Can you test the sql query for a date range?

DECLARE @TERM_STARTDATE datetime
DECLARE @TERM_ENDDATE datetime

SET @TERM_STARTDATE  = '05/05/2010' (Input: Start date of the period)
SET @TERM_ENDDATE ='05/08/2010' (Input: End date of the period)

SELECT sum(ISNULL(DAILY_AMOUNT,0) * DATEDIFF(day,TERM_START, TERM_END)) as amount FROM table_name WHERE DATEDIFF(day,@TERM_STARTDATE, TERM_START) >=0  AND DATEDIFF(day,@TERM_ENDDATE, TERM_END) <=0  
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ThomasianCommented:

SELECT SUM(DAILY_AMOUNT
           * DATEDIFF(day, CASE WHEN TERM_START>@RangeStart
                                THEN TERM_START
                                ELSE @RangeStart
                            END
                          , CASE WHEN TERM_END>@RangeEnd
                                THEN TERM_END
                                ELSE @RangeEnd
                            END
                     )
          ) As [Amount]
FROM tablename
WHERE ID=@ID
      AND TERM_START<=@RangeEnd
      AND TERM_END>=@RangeStart

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shachoAuthor Commented:
There we go.  Essentially an SQL version of my VB function.  Nifty.
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jogosCommented:
In calculation that must be datediff + 1
with case you can select the apropriate date
DECLARE @TERM_STARTDATE datetime
DECLARE @TERM_ENDDATE datetime

SET @TERM_STARTDATE  = '05/05/2010' -- (Input: Start date of the period)
SET @TERM_ENDDATE ='05/08/2010' --(Input: End date of the period)

select year(TERM_END) as y,month(TERM_END) as m
, sum(ISNULL(DAILY_AMOUNT,0) 
* (DATEDIFF(day,
  (case when TERM_START > @TERM_STARTDATE then TERM_START else @TERM_STARTDATE end) 
  , (case when TERM_END < @TERM_ENDDATE then TERM_END else @TERM_ENDDATE end))
  +1) as amount 
from tablename
where TERM_END >= @TERM_STARTDATE 
 and TERM_START <= @TERM_ENDDATE 
group by year(TERM_END),month(TERM_END)

Open in new window

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shachoAuthor Commented:
indeed
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jogosCommented:
sorry for duplicate, aswer was waiting for submit when I got a long call :)
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shachoAuthor Commented:
np - thanks for commenting.
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