How To Create A 'Two-Sided' Unique Index On Two Fields?

As long as it 'means' the same thing of course. It's probably less expensive to do it before it even gets to the database.

I think this can only be done using a FOR INSERT trigger (in combination with a unique constraint on the two columns). I'm not really fluent in MySql syntax (my T-SQL is better), so I guess the following will contain some errors.

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