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I have two tables that look like this Train +----------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +----------+-------------+------+-----+---------+-------+ | TrainID | varchar(11) | NO | PRI | NULL | | | Capacity | int(11) | NO | | 50 | | +----------+-------------+------+-----+---------+-------+ Reservations +---------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+---------+----------------+ | ReservationID | int(11) | NO | PRI | NULL | auto_increment | | FirstName | varchar(30) | NO | | NULL | | | LastName | varchar(30) | NO | | NULL | | | DDate | date | NO | | NULL | | | NoSeats | int(2) | NO | | NULL | | | Route | varchar(11) | NO | | NULL | | | Train | varchar(11) | NO | | NULL | | +---------------+-------------+------+-----+---------+----------------+ Currently, I'm trying to create a query that will increment the capacity on a Train if a reservation is cancelled. I know I have to perform a Join, but I'm not sure how to do it in an Update statement. For Example, I know how to get the capacity of a Train with given a certain ReservationID, like so: select Capacity from Train Join Reservations on Train.TrainID = Reservations.Train where ReservationID = "15"; But I'd like to construct the query that does this - Increment Train.Capacity by ReservationTable.NoSeats given a ReservationID If possible, I'd like to know also how to Increment by an arbitrary number of seats. As an aside, I'm plan

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