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You can't do this using parameters at all I'd suggest:
- upgrading so you can use filters across data sources, OR
- (maybe) creating a third dataset that contains your state/city hierarchy and using that to join all three
The first option would be preferred, the second option depends on how your data is currently formatted.
Thanks Chris !
this is exactly my struggle also. What do you mean by upgrading? I already have tableau desktop but I want to use the parameter in stead of a filter so I can filter with the url (but that's a different topic).
What I mean is that Mark is using v.9.3, in v.10.x (can't remember exact version, but 10.2 has it) you can use filters across datasources, which would definitely help with this problem.