I am impressed with the usefulness of Mark Harrison's plugin Database Query.  Within minutes of firing it up in DVD Profiler 4, among the 2645 items in my collection, I have created Flag Sets for: UPCs missing cover art (29 items), cover art that is duplicated for front and back (20), media type of Bluray-combos (27 BR/DVD combos), and duplicate titles (174).  Not that I needed more work to do, but DBQuery will ease winnowing the chaff. 

I also like the aggregate queries, such as Production Year by Decade and Media by Type; the last of which showed a Jack Benny Show DVD labeled as a 4K UltraHD combo....... not likely.  (It was a matter, when adding this Jack Benny DVD as a new contribution, the media type defaulted to DVD, Bluray & 4K, which went unnoticed by me until running DBQuery.)  Handy tool. 

I like the tool so much I will be making a donation to the cause shortly. Thanks Mark for a nice utility.