Hi all... I have a quick question, if anyone knows the answer. I've
built a query which looks at a set of records in a table (tblFilename)
and I've set it up so that it displays the following fields:
filename, filedate, origin
Let me first explain the data - filename contains filenames, of which
there could be multiple items... filedate is the respective date stamp
from the filename listed... origin is the folder name where the file
is located.
My query takes the max of filedate, which (to my understanding) would
eliminate all of the other records that have multiple filedate records
(it would only keep the newest one), leaving me with a list of unique
filenames. This works - as long as I am only trying to get two fields
- filename and filedate. As soon as I add "origin" as another field
(it throws a "Group By" in the Total: section), I get all the records
in the table. It no longer tosses out the older dates. So my question
is - why does this happen? Shouldn't I be able to get the related
'origin' field information of the records that I'm keeping? Is it the
"Group By" that is causing my grief? Keep in mind that I'm staying
within the query builder - my SQL skills aren't too strong. However, I
HAVE tried adding DISTINCT to the select statement, but it doesn't
reduce the resulting records that my query produces.
Maybe I'm not explaining myself very well - I'm not entirely sure. If
anyone has an idea, could you please set me straight? Thanks!
-Terry
6  1894  sy****@gmail.co m wrote: Hi all... I have a quick question, if anyone knows the answer. I've
built a query which looks at a set of records in a table (tblFilename)
and I've set it up so that it displays the following fields:
filename, filedate, origin
Let me first explain the data - filename contains filenames, of which
there could be multiple items... filedate is the respective date
stamp from the filename listed... origin is the folder name where
the file is located.
My query takes the max of filedate, which (to my understanding) would
eliminate all of the other records that have multiple filedate records
(it would only keep the newest one), leaving me with a list of unique
filenames. This works - as long as I am only trying to get two fields
- filename and filedate. As soon as I add "origin" as another field
(it throws a "Group By" in the Total: section), I get all the records
in the table. It no longer tosses out the older dates. So my
question is - why does this happen? Shouldn't I be able to get the
related 'origin' field information of the records that I'm keeping?
Is it the "Group By" that is causing my grief? Keep in mind that I'm
staying within the query builder - my SQL skills aren't too strong.
However, I HAVE tried adding DISTINCT to the select statement, but it
doesn't reduce the resulting records that my query produces.
Maybe I'm not explaining myself very well - I'm not entirely sure. If
anyone has an idea, could you please set me straight? Thanks!
-Terry
Max of filedate, group by filename
....returns the most recetn date for the unique values of filename. sy****@gmail.co m wrote: Hi all... I have a quick question, if anyone knows the answer. I've
built a query which looks at a set of records in a table (tblFilename)
and I've set it up so that it displays the following fields:
filename, filedate, origin
Let me first explain the data - filename contains filenames, of which
there could be multiple items... filedate is the respective date
stamp from the filename listed... origin is the folder name where
the file is located.
My query takes the max of filedate, which (to my understanding) would
eliminate all of the other records that have multiple filedate records
(it would only keep the newest one), leaving me with a list of unique
filenames. This works - as long as I am only trying to get two fields
- filename and filedate. As soon as I add "origin" as another field
(it throws a "Group By" in the Total: section), I get all the records
in the table. It no longer tosses out the older dates. So my
question is - why does this happen? Shouldn't I be able to get the
related 'origin' field information of the records that I'm keeping?
Is it the "Group By" that is causing my grief? Keep in mind that I'm
staying within the query builder - my SQL skills aren't too strong.
However, I HAVE tried adding DISTINCT to the select statement, but it
doesn't reduce the resulting records that my query produces.
Maybe I'm not explaining myself very well - I'm not entirely sure. If
anyone has an idea, could you please set me straight? Thanks!
-Terry
Max of filedate, group by filename
....returns the most recent date for the unique values of filename.
Max of filedate, group by filename and origin
....returns the most recent date for the unique combination of both values
filename and origin combined.
--
Rick Brandt, Microsoft Access MVP
Email (as appropriate) to...
RBrandt at Hunter dot com
Rick Brandt wrote:
Max of filedate, group by filename
...returns the most recent date for the unique values of filename.
Max of filedate, group by filename and origin
...returns the most recent date for the unique combination of both values
filename and origin combined.
--
Rick Brandt, Microsoft Access MVP
Email (as appropriate) to...
RBrandt at Hunter dot com
Aaaahhh... Okay - I see the logic behind that part of it now. Thanks
for opening my eyes to that! However, is there a way that a person
could get the origin record for the records with latest date? (Pull
the Origin field with the rest of the query WITHOUT the Order By)?
Thanks for your reply, Rick! I appreciate it! sy****@gmail.co m wrote: Aaaahhh... Okay - I see the logic behind that part of it now. Thanks
for opening my eyes to that! However, is there a way that a person
could get the origin record for the records with latest date? (Pull
the Origin field with the rest of the query WITHOUT the Order By)?
Thanks for your reply, Rick! I appreciate it!
If you don't care which origin then you could replace that GroupBy with First,
Last, Min, or Max. If you want the same origin as the record with the last date
then you can use two queries. First create a query that gives the filename and
max(date) then feed that into a second query that also includes the original
table. Join the query to the table on the filename and filedate fields and then
bring down all three fields.
--
Rick Brandt, Microsoft Access MVP
Email (as appropriate) to...
RBrandt at Hunter dot com
More FYI than anything, you could also a query with a nested subquery:
SELECT fnMain.FileName , fnMain.FileOrig in, fnMain.FileDate
FROM FileNames AS fnMain
WHERE (((fnMain.FileD ate)=(Select Max(FileDate) From FileNames as fnSub
Where fnSub.FileName = fnMain.FileName )));
Outside query selects name, origin, and file date.
Inner (or sub-) query finds the maximum file date for the file on a given
row.
The where clause links the two by comparing the filedate on each row to the
retrieved maximum filedate for the file on that row.
Rick Barndt's two queries will fun faster.
Thank you all so much for the information! I appreciate you taking the
time to explain that to me! The two queries worked fine, and I am
going to (for learning's sake) try out the subquery later today!
Everyone have a great day!
-Terry
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