MS Access Totals Query Sum Field Incorrect Result - ms-access

Question

I've built what I believe to be a simple query in MS Access.
Two Tables are involved:
Properties
History
The History table includes multiple rows of data for each property, and for various dates.
I'm trying to show the sum of net_value for a specific date for properties that share a common area in the property table.
Here's my query:
SELECT Properties.Area
, History.HIST_DATE
, History.ID
, Sum(History.NET_VALUE) AS SumOfNET_VALUE
FROM Properties INNER JOIN History ON Properties.ID = History.ID
WHERE (((History.Account_ID)=45))
GROUP BY Properties.Area, History.HIST_DATE, History.ID
HAVING (((Properties.Area)="MY AREA") AND
((History.HIST_DATE)=#2/1/2017#));
The problem is, the sum field is wildly incorrect.
Debugging
The root cause of the issue is that there are multiple entries of Properties.ID.
So I suppose the select is not distinct? Is there a way around this?
The Properties.ID is effectively an account identifier and multiple properties can be associated with it; so I can't really limit Properties.ID to one record per ID... thoughts?

Answer 1

It looks like History.ID is a unique field, or at least unique to each property.
By including it in your query the sum will group on that ID as well as the area, so you'll end up with a total per property per area.
No idea where Account_ID comes into it, but have included it in the WHERE clause anyway.
SELECT Properties.Area
, History.Hist_Date
, SUM(History.Net_Value) AS Total_Net_Value
FROM Properties LEFT JOIN History ON Properties.ID = History.ID
WHERE History.Account_ID = 45 AND
Properties.Area = "My Area"
History.Hist_Date=#04/27/2018#
GROUP BY Properties.Area
, History.Hist_Date

Answer 2

Try this one:
SELECT Properties.Area
, History.HIST_DATE
, History.ID
, Sum(History.NET_VALUE) AS SumOfNET_VALUE
FROM Properties INNER JOIN History ON Properties.ID = History.ID
WHERE ((History.Account_ID)=45)
AND (Properties.Area)="MY AREA"
AND (History.HIST_DATE)=#2/1/2017#))
GROUP BY Properties.Area, History.HIST_DATE, History.ID;
Do not use HAVING clause as Filter except for aggregate function, see here. Use WHERE Part instead.
HAVING would be reasonable for ...HAVING SumOfNET_VALUE > 200, for example.