rumbin commented on issue #4406: Need to use more than table in a slice and 
able to make List of values(LOVs) for filtering   
URL: 
https://github.com/apache/incubator-superset/issues/4406#issuecomment-365365071
 
 
   Assuming that the second table resides within the same DB, you have at least 
three options:
   
   * create a view in the source DB where the second table is joined in
   * do virtually the same thing via visualizing an SQLLab query where you 
perform the join
   * define a new column for the first table that is defined by a correlated 
subquery on the second column
   
   When the second table is from a different DB, I don't see any options other 
than integrating the two DBs via external tools like dremio.com.

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