MySQL syntax for Join Update

MySQL supports a multi-table UPDATE syntax, which would look approximately like this:

UPDATE Reservations r JOIN Train t ON (r.Train = t.TrainID)
SET t.Capacity = t.Capacity + r.NoSeats
WHERE r.ReservationID = ?;

You can update the Train table and delete from the Reservations table in the same transaction. As long as you do the update first and then do the delete second, it should work.

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