?
Solved

MS Access - updating field with count of records

Posted on 2009-07-02
7
Medium Priority
?
1,188 Views
Last Modified: 2013-11-27
I think I have to push this out to a temp table then update - hoping there is a more direct way...

Table looks like

ID        State     Code
1          FL          123
2          FL           123
3          FL           456
5          AL           789

I want to update the SAME table to

ID        State     Code      Count of State           Count of Code
1          FL          123           3                               2
2          FL           123          3                               2
3          FL           456          3                               1
5          AL           789          1                               1

Is there a way to do this in a query or two.  As I said above I think I need to push the counts to a temp table then update....
I'm hoping I don't have to do that.
Thanks
Keith
0
Comment
Question by:keschuster
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
7 Comments
 
LVL 120

Expert Comment

by:Rey Obrero (Capricorn1)
ID: 24767009
try this query

select ID, State, Code, (select Count(*) from tablex A where A.State=Tablex.state) as CountOfState, (select Count(*) from tablex A where A.code=Tablex.code) as CountOfCode
from Tablex;
0
 

Author Comment

by:keschuster
ID: 24767092
That gives me the numbers - How do I update the two last columns.  I get the error, must use updatable query
0
 
LVL 93

Expert Comment

by:Patrick Matthews
ID: 24767601
keschuster said:
>>How do I update the two last columns

With respect, you shouldn't try.  Those are derived data, and as such should not be stored in the db.  Rather,
you should calculate them on demand in your queries, reports, and/or forms.
0
NFR key for Veeam Backup for Microsoft Office 365

Veeam is happy to provide a free NFR license (for 1 year, up to 10 users). This license allows for the non‑production use of Veeam Backup for Microsoft Office 365 in your home lab without any feature limitations.

 
LVL 120

Assisted Solution

by:Rey Obrero (Capricorn1)
Rey Obrero (Capricorn1) earned 400 total points
ID: 24767635
just convert the query to a make table query


SELECT Tablex.ID, Tablex.State, Tablex.Code, (select Count(*) from tablex A where A.State=Tablex.state) AS CountOfState, (select Count(*) from tablex A where A.code=Tablex.code) AS CountOfCode INTO TableX_1
FROM Tablex;
0
 

Author Comment

by:keschuster
ID: 24767655
Cap -
Is was trying to avoid creating a new table
Is it possible to update TableX with those values?  
0
 
LVL 5

Accepted Solution

by:
Lawrence Barnes earned 1600 total points
ID: 24767956
If the table is not large you could used a domain function.  In your update query you would place this in the "update to" portion.  If you have many records, then I would go with Capricorn's direction as domain functions take a long time on large tables.

* Something to consider:  Do you want the Code count to be across all states or the number of codes within the state?  I'll assume it will be the number of codes within the state for now.
* I'm also assuming that the code is a number format.

Domain function (I use if it is less than 10,000 rows.)
1) Create a new query with the table in it.  Right click on the table name in the query designer and rename it.  If the table name was [tblStateCodes], I would rename it to [aliastblStateCodes].
2) Place the code below into your update query's update to row.  (Make sure column names match.)

I've attached a sample db for you.  My guess is that Capricorn showed me this a few years ago in one of his posts.

Good luck,

LVBarnes
tblStateCodes
ID Autonumber
State Text
Code Long Integer
 
CountOfState: DCount("State","tblStateCodes","State='" & [aliastblStateCodes].[State] & "'")
 
CountOfCode: DCount("Code","tblStateCodes","State='" & [aliastblStateCodes].[State] & "' AND Code=" & [aliastblStateCodes].[Code])

Open in new window

Counts.mdb
0
 
LVL 74

Expert Comment

by:Jeffrey Coachman
ID: 24770671
keschuster,

<Is it possible to update TableX with those values?  >
Again, as stated eariler, you really do not want to "Store" calculated data, except in rare circumstances.

Just FYI

JeffCoachman
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Access developers frequently have requirements to interact with Excel (import from or output to) in their applications.  You might be able to accomplish this with the TransferSpreadsheet and OutputTo methods, but in this series of articles I will di…
Code that checks the QuickBooks schema table for non-updateable fields and then disables those controls on a form so users don't try to update them.
Basics of query design. Shows you how to construct a simple query by adding tables, perform joins, defining output columns, perform sorting, and apply criteria.
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …
Suggested Courses

777 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