Average costs over custom time range in QlikView - qlikview

Question

I have a table looking like this:
ReadingDate,=avg(Cost)
11/04/2011,£10.00
28/05/2011,£326.00
02/06/2011,£12.00
28/06/2011,£53.00
10/09/2011,£956.00
11/10/2011,£63.00
01/01/2012,£36.00
11/04/2012,£150.00
12/05/2012,£100.00
I know how to make an avg of a day or month, but how do I make limitations like 'between 01.05.2012 and 11.11.2013' and getting one average from it?

Answer 1

If you would like to do this in the load script, you can create a temporary table where you can perform the average over your desired range and then store this in a variable.
I used your source data for the below example:
SET DateFormat='DD/MM/YYYY';
MyData:
LOAD * INLINE [
ReadingDate, Cost
11/04/2011, 10.00
28/05/2011, 26.00
02/06/2011, 12.00
28/06/2011, 53.00
10/09/2011, 956.00
11/10/2011, 63.00
01/01/2012, 36.00
11/04/2012, 150.00
12/05/2012, 100.00
];
AverageData:
LOAD
avg(Cost) as AvgCost
RESIDENT MyData
WHERE (ReadingDate > '28/05/2011') AND (ReadingDate < '01/01/2012');
DROP TABLE AverageData;
LET AverageCost = peek('AvgCost',0,'AverageData');
Here, AverageCost is your variable and contains a single number (in this case 271). which you can then use later on in the script, for example:
MyData2:
NOCONCATENATE
LOAD
ReadingDate,
Cost
$(AverageCost)
RESIDENT MyData;
This then results in the following:
11/04/2011, 10.00, 271
28/05/2011, 26.00, 271
02/06/2011, 12.00, 271
28/06/2011, 53.00, 271
10/09/2011, 956.00, 271
11/10/2011, 63.00, 271
01/01/2012, 36.00, 271
11/04/2012, 150.00, 271
12/05/2012, 100.00, 271