Access 97: DLookup Query Criteria Question

To keep it short: I have a Query where I am trying to set up DLookup criteria based on the following tables and headers (simplified):

table 1: ID, topic, location, team
table 2: ID, topic, location
table 3: team, topic, location

Basically in my criteria I want to return the following:
if the ID in table 1 = the ID in table 2 return the topic from table 2; if not, but if team in table 1 = team in table 3, return the topic in table 3

I'll need to do something similar for location, but I should be able to figure it out based on the response.

Thanks in advance
TheJManAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

jadedataMS Access Systems CreatorCommented:
Hey TheJMan!

  Are you sure you don't want to just link in the appropriate tables??
  Djunk() functions are slow.  And compound that with using them as an expression in a column, where they have to run ONCE FOR EACH RECORD, slower.  Compound that with creating three such expression columns, SLOWEST!

  I would recommend that you use JOINs in the query to achieve this.

regards
Jack
bonjour-autCommented:
3 little qeries:

qry1 - does 1st condition

SELECT tab1.ID, tab2.topic
FROM tab1 INNER JOIN tab2 ON tab1.ID = tab2.ID;

qry2 -  does 2nd, where 1st is null

SELECT tab1.ID, tab3.topic
FROM (tab1 INNER JOIN tab3 ON tab1.team = tab3.team) LEFT JOIN tab2 ON tab1.ID = tab2.ID
WHERE (((tab2.ID) Is Null));

qryfinal - does a UNION of above

SELECT * FROM qry1
UNION SELECT * FROM qry2;

could be also done in one with subqueries, but seperate version will also run on A97

regards, Franz
TheJManAuthor Commented:
Thanks for the reply's.   Franz, I am pretty weak with SQL statements.  For your query one example where table 1 = "master table" and table 2 = "Learning Fair Presenter Lookup" I wrote the following in the criteria box under field = ID and table = master table in my (select) query:

=INNER JOIN [Learning Fair Presenter Lookup] ON [master table].[ID]=[Learning Fair Presenter Lookup].[ID]

As you are probably guessing, it didn't work. Is it a formatting issue or am I way off base?

I may follow up again on the left join and union queries b/c I've never constructed SQL statement queries before

Thanks again
Acronis True Image 2019 just released!

Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.

TheJManAuthor Commented:
Franz, I think I'm getting closer on query 1 (see below): but I still get a syntax error

SELECT master table.ID, Learning Fair Presenter Lookup.ID
FROM master table INNER JOIN Learning Fair Presenter Lookup
ON master table.ID = Learning Fair Presenter Lookup.ID
TheJManAuthor Commented:
Got it working on number 2
bonjour-autCommented:
so do you need further support on that ?

if it helps, download this little example :

http://www.tplus.at/~sissi-franz/test/topics.mdb

the UNION query cannot be looked at in design mode, SQL only

Regards, Franz

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Microsoft Access

From novice to tech pro — start learning today.