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Bunch of ineffective entries too, all patterns containing underscores won't ever match.

Underscore matches any single char, so those patterns work fine. It’s an efficient way to match any small separator, like space, dashes, etc.

I didn't know _ is a metachar in LIKE expressions, thanks! Not the first time its syntax caught me off-guard.

It only has two, doesn't it? Underscore for "any single character", and percent for "any string of characters", AFAIK.