I have Idea to connecting postgres and how we can make join condiion.but for relavent to this problem I dont how what tables I need to use with what all condtion and what all columns will be useful for me
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Take a look at table: _users field: login (should be last login datetime)
No joining necessary. Just filter on users where that field is null or > than 180 days from today.
Just an FYI
You can use any table that starts with an underscore.
The join conditions are VERY intuitive. i.e. workbook.id = view.workbook_id
Tableau's join assumption will ALWAYS be wrong because it will always assume id=id is what you're looking for but as stated above it's not.