[mso] Re: Access 2002 Doesn't Link Null Data
- From: "David Smart" <smartware@xxxxxxxxxxxxxxx>
- To: <mso@xxxxxxxxxxxxx>
- Date: Sat, 17 Nov 2007 10:14:05 +1100
Just as a further left v right argument. When you have optional joins, they
are referred to in the SQL as left or right joins, depending on the
direction of optionality. They are certainly easier to visualise if the
master table is placed on the left in the design view.
Regards, Dave S
----- Original Message -----
From: <Cathy.Evans@xxxxxxxxx>
To: <mso@xxxxxxxxxxxxx>
Sent: Saturday, November 17, 2007 12:40 AM
Subject: [mso] Re: Access 2002 Doesn't Link Null Data
> 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>
> Sent by: mso-bounce@xxxxxxxxxxxxx
> 11/16/2007 02:26 AM
> Please respond to mso
>
> To
> mso@xxxxxxxxxxxxx
> cc
>
> Subject
> [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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