[mso] Re: Access 2002 Doesn't Link Null Data
- From: Cathy.Evans@xxxxxxxxx
- To: mso@xxxxxxxxxxxxx
- Date: Fri, 16 Nov 2007 08:40:15 -0500
Thanks for the detailed info, it is helpful. No, the left to right
doesn't matter except in my adled brain it just helps me to visually keep
track of the flow when I'm looking at the query grid, and if I place the
master on the left, it helps me work out the joins. Sorry for adding to
any confusion. I work with alot of linked tables to other systems, where
I don't have control over the table structure, relationships, etc., and
have learned to work out the kinks in the query and the joins make all the
difference, so it just works out better for me to keep track and was
sharing what I found to be helpful. Sometimes I toggle into the SQL view
to further work things out, but then toggle back into the design view to
'see' better.
If you don't get duplicates on the last/first name matches, that should do
for the unique ID. I see David's reply with recommended SQL, that looks
like the right way to go, it should get you on the right track - will keep
an eye on this thread, thanks for the info, Cathy
Ray Shapp <ras45@xxxxxxxxxxxxx>
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11/16/2007 02:26 AM
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[mso] Re: Access 2002 Doesn't Link Null Data
Hi Cathy,
Thank you for the reply.
<<What is the recordsource for the existing query? >>
The existing query extracts a subset from a single master table which
contains
records for all the people who have been members of our club since data
was
computerized about twenty years ago. The existing query merely extracts a
single record for each currently active member. All fields in the master
table
are represented in the Active Members subset.
<<Is there a primary key for an ID in the master table?>>
No. The combination of Last_Name and First_Name fields uniquely identifies
each member. We also have a field for middle initial, but I don't think it
has
ever been needed to resolve duplicates. We have added "Jr" to First_Name
entry
for a few individuals.
<<...more info on the master data table structure it would be helpful. >>
A single record containing about 500 bytes in 30 fields of data contains
all
the info pertinent to a single individual. We have about a thousand such
records, but only a little over 200 records pertain to currently active
members.
<<Are the links in this new query one to one or one to many? >>
The links are one to one. I join Last_Name in Active Members query to Last
Name in the new query. I similarly join First_Name.
<< I was taught to build my queries from left to right,>>
I'm not sure what significance there is in the left/right placement in my
case. How does it matter whether the master table is to the left or right
of
the Active Members query? In my case I have placed the Active Members
query to
the left of the master table. Would my results differ if I reversed the
order?
Thanks for the help.
Ray Shapp
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