What is The correct way to remove duplicates from the iTunes library?

I have a 300GB external drive which over the last 5 years has got bloated with duplicate tracks.
If I use the show duplicates option, I see 10,479 songs totalling over 50GB. Now, those songs that are shown, do they include the original that they are a duplicate of, or are they JUST the duplicates?
I have been sorely tempted to select all and delete to the trash, but I want to be 100% sure I don't delete any originals. Also, there are some duplicate tracks that are genuine dupes, for example, I have an original LP with a particular track on it, but then that exact track appears on a compilation LP, so I don't want to remove the compilation LP tracks as then the compilation is incomplete.
I have Tidy Up installed, but I'm a bit wary to use it as I want to be 10% sure I do the right thing, it's a lot of money to lose, and I'm a DJ, so this is thousands of conversions from my vinyl collection and stuff purchased and ripped from CD.
I see many methods of getting rid of duplicates but no definitive answer for someone in my position.
Many thanks all!

Akuwa wrote:
This is supposed to be a fix to the result from SQL. Currently no access to the SQL code so we have to fix in he Java code...Then really, whoever said you couldn't change the SQL has absolutely no right to turn around and demand the fastest way to remove the duplicates in Java. It's almost certain that the fastest way to remove the duplicates would be for the SQL not to select them in the first place, so if you don't permit changing the SQL then it's clear you aren't interested in the fastest way.

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