I created table CustProf based on your data.
I reformatted your dates to be in my regional format.
You need to enclosed dates in #.
Code:
SELECT [Customer Number], AVG ([VAL_BAL]) AS average,[Balance Date]
FROM [custprof]
GROUP BY [customer Number], VAL_BAL,[Balance Date]
HAVING [Balance Date] BETWEEN #1/2/2014# AND #28/2/2014#
Result
Code:
Customer Number |
average |
Balance Date |
40001 |
1724.68 |
02/01/2014 |
40001 |
1724.68 |
02/02/2014 |
40001 |
1724.68 |
13/02/2014 |
40001 |
1724.68 |
14/02/2014 |
40001 |
1724.68 |
15/02/2014 |
40001 |
1724.68 |
16/02/2014 |
40001 |
1724.68 |
17/02/2014 |
40001 |
6424.68 |
27/02/2014 |
40001 |
6424.68 |
28/02/2014 |
40001 |
86424.68 |
21/02/2014 |
40001 |
86424.68 |
22/02/2014 |
40001 |
86424.68 |
23/02/2014 |
40001 |
86424.68 |
24/02/2014 |
40001 |
86424.68 |
25/02/2014 |
40001 |
86424.68 |
26/02/2014 |
40001 |
186724.68 |
19/02/2014 |
40001 |
186724.68 |
20/02/2014 |
40001 |
201724.68 |
18/02/2014 |