?
Solved

ms/access 2013 how to cumulate values in a query

Posted on 2014-12-26
12
Medium Priority
?
161 Views
Last Modified: 2014-12-28
I have a query on which I need to compute the growth of a population. On the query I have a value [BaseYearPop] that is the population for the base year. On the record I do also have [GrowthRate] that is the population growth rate for that specific year. I need to compute [CurrentYearPop] that is the anticipated population for that year, which is a cumulative computation (all previous years growth plus that specific years).

How do I do it?
0
Comment
Question by:João serras-pereira
  • 7
  • 4
12 Comments
 
LVL 24

Expert Comment

by:Phillip Burton
ID: 40519462
There are two approaches.

1. You can use a DSUM function, so you have the field name, table, and criteria (I.e. =< the current year), or

2. You can use a self-join, and instead of using the = operator on the join, use a =<

approach 1 is simpler to do, but 2 is faster if you have a lot of data. See http://www.techonthenet.com/access/functions/domain/dsum.php for infomation on approach 1.
0
 

Author Comment

by:João serras-pereira
ID: 40519664
From the samples, I'll try this one and let you know:

DSum("UnitPrice * Quantity", "Order Details", "OrderID = 10248")
0
 

Author Comment

by:João serras-pereira
ID: 40519748
well ...
I am not getting there...

I am sending you the database; the issue is on query "_QQ" and it is the last statement. I am getting always the same number....
sireshDB-11.accdb
0
The new generation of project management tools

With monday.com’s project management tool, you can see what everyone on your team is working in a single glance. Its intuitive dashboards are customizable, so you can create systems that work for you.

 
LVL 24

Expert Comment

by:Phillip Burton
ID: 40519826
I'm on holiday so I can't open the database on my iPad.

However, if myYear is the year, then the code should be something like:

DSum("GrowthRate", "myTable", "myYear <= " & [myYear]) + BaseYearPop
0
 

Author Comment

by:João serras-pereira
ID: 40519853
although it still does not operate as expected, I have updated the _QQ query to what I thought could resolve the situation; bit it did not. I am uploading the novel file.
sireshDB-11.accdb
0
 
LVL 24

Expert Comment

by:Phillip Burton
ID: 40519858
Why does it not operate as expected?
0
 

Author Comment

by:João serras-pereira
ID: 40519860
Ok. Here is the query:

screen  shot

sreen shot 2
code:

PopAnual: (DSum("PopPNUD_2014 * TaxaPopulacao ^anoInx";"SustentEconFin";[SustentEconFin]![anoInx]<=[anoinx] And [SustentEconFin]![RefTabanca]=[Reftabanca] And [SustentEconFin]![ano]=[ano]))
0
 

Author Comment

by:João serras-pereira
ID: 40519861
there is no sum(dsum(...))... just dsum(...)
0
 
LVL 41

Expert Comment

by:PatHartman
ID: 40519945
I don't know if this is your problem but:
PopPNUD_2014 * TaxaPopulacao ^anoInx -- interpreted as PopPNUD_2014 * (TaxaPopulacao ^anoInx)
Is different from
(PopPNUD_2014 * TaxaPopulacao) ^anoInx

Whenever you write an expression that contains operators of unequal precedence, it is best to be explicit by using parentheses to specify the order of operation.
0
 

Author Comment

by:João serras-pereira
ID: 40520228
nope... that  was not the problem and I an aware of the operator precedence (actually, the formula is wrong and I am correcting it.

the problem is a bit different, let me try to put it in clearer (hopefully) words.

I have a query (_QQ) with a Population for a village. so the relevant columns are [RefTabanca] [PopPNUD_2014]  [ano] [anoinx] and [TaxaPopulacao].

[ano] is the Year (2014, 2015, ...)
[anoinx] is the ano sequence number (1 for 2014, 2 fr 2015....)
[RefTabanca] is the key code for a village
[PopPNUD_2014] is the value of the population for 2014

Now I need to compute, for each [RefTabanca] the new value of the population based on the previous year total and adding the [TaxaPopulacao] value, that varies from year to year.

The direct formula should be something like:

[ActualPopulation] :
   iif( is the first record of [RefTabanca] then
         [PopPNUD_2014];
        [ActualPopulation of previous record] * (1 + [TaxaPopulacao])
      )

so it accumulates the population over the years. I have this problem for a number of fields, this is why it is important for  me to sort it. In the end, I should have one record per year and village.

I would really appreciate any help
0
 
LVL 24

Accepted Solution

by:
Phillip Burton earned 2000 total points
ID: 40520280
Going back to your screenshots, your third parameter needs to be partially in quotation marks, and partly outside.

Have a look at my example to show you what should be in what:

"MyYear < = "  & [MyYear}
0
 

Author Closing Comment

by:João serras-pereira
ID: 40520320
thanks a lot for excellent help!!!!
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you’re using QODBC to update QuickBooks data from Microsoft® Access but Access is not showing the updated data, you could have set up QODBC incorrectly.
Audit trails are very important in any system to hold people responsible for certain transactions and hold them to take ownership of their actions. This article is dedicated to all novice "Microsoft Access" developers.
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …
The Relationships Diagram is a good way to get an overall view of what a database is keeping track of. It is also where relationships are defined. A relationship specifies how two tables connect to each other. As you build tables in Microsoft Ac…
Suggested Courses

593 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question