Explanation
You can export the data in a Tableau data source, including all or part of the records from your original data.
Alternatively, you can export only the portion of data used to generate the view.
Since the question mentions the data used to build the view, we'll focus on that :
*Export data in the view to Microsoft Access or .csv*
Export the data that is used to generate the view as an Access database (Windows only) or .csv file (Mac only).
1) In Tableau Desktop, select Worksheet > Export > Data.
2) Select a location and type a name for your Access database or .csv file.
3) Click Save.
4) If you're on Windows, the Export Data to Access dialog box displays to give you the option to immediately use the new Access database and continue working in Access without interrupting your work flow.

Explanation
We can perform filter, URL and highlight actions out of the above given choices on a dashboard. Please refer to the image below:

Explanation
It is possible to join a maximum of 32 tables in Tableau!

Explanation
Yes, due to the nature of blends, there are some conditions as follows from the official documentation that must be kept in mind while working with blends:


In addition to handling calculations slightly differently, there are some limitations on secondary data sources.
You may not be able to sort by a field from a secondary data source, and action filters may not work as expected with blended data. For more information, see Other data blending issues.

Explanation
You can drag the filter by clicking on the 2 lines on top, and then dragging the filter as shown: