?
Solved

Access Query to filter table by Highest Value found in two Fields + iif logic

Posted on 2008-10-08
3
Medium Priority
?
640 Views
Last Modified: 2013-11-28
I have a table in Access with the following fields (see attachment 1):
ParentPart
Version
Route
Component
QtyPer

I would like to write a query using the logic of the following psuedocode:
If Version is null, then return each record for each "ParentPart" where the "Route" is the highest value for that "ParentPart", If Version is not null, then ignore the route and return each record for each "ParentPart" where the "Version" is the highest value for that "ParentPart".

Basically for each parent part I want to grab the entire row if the version number is the highest value in the entire table or if version is null if the route is the highest value.

The second attached file shows what the Output of the query would be for the query.

Thanks for the help







table.jpg
table2.jpg
0
Comment
Question by:Cubemaster
1 Comment
 
LVL 60

Accepted Solution

by:
Kevin Cross earned 2000 total points
ID: 22676003
Try with a derived table:
SELECT b1.*
FROM BOMTable b1 
INNER JOIN (SELECT ParentPart, Max(Version) AS maxVersion, Max(Route) AS maxRoute FROM BOMTable GROUP BY ParentPart) b2
ON b1.ParentPart = b2.ParentPart
AND (b1.Version = b2.maxVersion 
     OR (IsNull(b1.Version)=1 AND b1.Route = b2.maxRoute))

Open in new window

0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

An alternative to the "For XML" way of pivoting and concatenating result sets into strings, and an easy introduction to "common table expressions" (CTEs). Being someone who is always looking for alternatives to "work your data", I came across this …
Microsoft Access has a limit of 255 columns in a single table; SQL Server allows tables with over 255 columns, but reading that data is not necessarily simple.  The final solution for this task involved creating a custom text parser and then reading…
Using Microsoft Access, learn some simple rules for how to construct tables in a relational database. Split up all multi-value fields into single values: Split up fields that belong to other things into separate tables: Make sure that all record…
Look below the covers at a subform control , and the form that is inside it. Explore properties and see how easy it is to aggregate, get statistics, and synchronize results for your data. A Microsoft Access subform is used to show relevant calcul…

807 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