unique records Access 2003

  • Thread starter Thread starter RogerBPWD
  • Start date Start date
R

RogerBPWD

Problem: Eliminate duplicate values based on one field and still maintain the
availablity of otherfields for the retained record.

I sort on date to bring the most recent record to the top and then want to
eliminate the duplicates of valveID.

valveID Date
1 5-19-10
1 4-10-10
1 2-15-10
2 5-8-10 start point
2 3-15-10
3 5-19-10
3 3-15-10

_____________________

1 5-19-10
2 5-8-10 desired results
3 5-19-10


I have tried Unique value and end up with either ValveID only or no records
eliminated. Same for distinct

After the duplicates are eliminated I then need to do further
sorting/filtering based on date.

Thanks for the help.
 
Yes I have duplicate valveIDs with different dates how can I remove all but
the latest date entry tied to a valveID as in my desired result?

Jerry Whittle said:
SELECT valveID, Max([Date])
FROM YourTable
GROUP BY valveID
ORDER BY valveID;

If you have a duplicate valveID/Mas of Date combos, it will return all ties.
You could try changing SELECT to SELECT DISTINCT .
--
Jerry Whittle, Microsoft Access MVP
Light. Strong. Cheap. Pick two. Keith Bontrager - Bicycle Builder.


RogerBPWD said:
Problem: Eliminate duplicate values based on one field and still maintain the
availablity of otherfields for the retained record.

I sort on date to bring the most recent record to the top and then want to
eliminate the duplicates of valveID.

valveID Date
1 5-19-10
1 4-10-10
1 2-15-10
2 5-8-10 start point
2 3-15-10
3 5-19-10
3 3-15-10

_____________________

1 5-19-10
2 5-8-10 desired results
3 5-19-10


I have tried Unique value and end up with either ValveID only or no records
eliminated. Same for distinct

After the duplicates are eliminated I then need to do further
sorting/filtering based on date.

Thanks for the help.
Click to expand...
Click to expand...
 
If you need to be able to change data in the records after they are returned
then you will need to use a correlated sub-query to return the records.

SELECT *
FROM SomeTable
WHERE SomeTable.Date =
(SELECT Max(Temp.Date)
FROM SomeTable As Temp
WHERE Temp.ValveID = SomeTable.ValveID)

In Design view
== Add your table
== Select all the fields you want to see
== Add criteria under the Date field that looks like the above. Replace
SomeTable with the name of your table.
(SELECT Max(Temp.[Date])
FROM [SomeTable] As Temp
WHERE Temp.ValveID = [SomeTable].ValveID)

John Spencer
Access MVP 2002-2005, 2007-2010
The Hilltop Institute
University of Maryland Baltimore County
 
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