sql - MySQL String match percentage -

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In MySQL, how can I compare two strings and get matching percentages I ("foo", " ("Foo", "fo") = 0.0 Compare = 0.75 ("foo", "fo") = 0.0 (compare with "foo", "fobar") = 0.5 ("foo", "foofoo") = 1.0

I hope you get this idea :)

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