Hi John!
I made a query based on these three forms which don't have any connection
with each other except connection to 4 form projects . The data represents
incorrectly when I try to execuate query it shows data 5 times more that it
should be. I tryied with UNION and GROUP BY but it doesn't help. Can you
recommend me what to do in such situation?
Correct the error in your query. I expect there's a cartesian join somewhere;
if the forms have the same "shape" of data it's likely that you'll want a
UNION query (stringing records together end to end) rather than a JOIN query
(joining records side by side).
If you would like help doing so post the SQL and enough of the context that
someone who can't see your database would be able to figure it out.