It is important to understand the relationship between the two tables so we can suggest the right way forward.
First of all by introducing a new common field you create a synthetic key in you data model - which is most often not very good.
Can you confirm whether:
The Park had a number of Exhibitions right? And the Identity Number is a person that is admitted to a park and goes to 0 or more exhibitions? The Admitted Date is not necessarily the same date as Visit Date is it? It could be or it could be some following dates?
If the only thing that should link the two tables is the Identity Number then you should name the Identicator differently like you do with the other fields except the Identity Number.
We can get back to how to graph this as long as you confirm how the fields and tables should relate...
Park and Exhibitions visits are not related. However I am trying to link the 2 tables with Identity Number so that I am able to find out how many of the same people visited Exhibition and Park on the same date/ with the same status.
I have managed to come out with something using the qualify method. May I seek your kind advice if this is an appropriate way to proceed?