A couple of thoughts:
1) The "union" really only pertains to the entity table rows; once you
"union all" those (duplicates should not matter and probably will not even
be present so using "all" avoids an unnecessary sort) you can join that
sub-query to the document_usage table.
2) Since every entity must have an associated company moving the company_id
field to the entity table will allow a direct search for company objects
using entity alone and remove the need to perform the union. The "company"
table omits the implicit self-referencing company_id but it is still there
in reality.
David J.
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