Multiple join in mysql

I am trying to开发者_如何学Go do a multiple join like this

SELECT * FROM (((Customer FULL JOIN Booking ON Customer.ID = Booking.CustID) 
FULL JOIN Flight ON Booking.FlightID = Flight.ID) 
FULL JOIN FlightRoute ON Flight.RouteID = FlightRoute.ID)

But it is syntactically incorrect according to mysql. Please help

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There is no FULL JOIN in MySQL. It's convoluted but a FULL JOIN is equivalent to a UNION ALL between a LEFT JOIN and a RIGHT JOIN, using a condition to remove duplicates. It's late in the day and the thought of your 3 FULL JOINs in that statement is hurting my head.

You do say in Conrad Frix's answer that removing the FULL makes it work, if it does then you have misunderstood how FULL JOINs and INNER JOINs work.

For the first FULL JOIN it would look like:

SELECT * FROM Customers c
   LEFT JOIN Booking b ON c.ID = b.CustId
UNION ALL
SELECT * FROM Customers c
   RIGHT JOIN Booking b ON c.ID = b.CustId
WHERE c.ID IS NULL

Use that basis to form the rest of your statements.

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When i was looking about MySql and FULL Join i found this article which explains a number of ways to emulate FULL JOIN in Mysql. I think it could be usefull to you.

How to simulate FULL OUTER JOIN in MySQL

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MySQL isn't my area of expertises but I don't think MySQL supports full joins. I found a simple article that details some alternatives.

http://www.xaprb.com/blog/2006/05/26/how-to-write-full-outer-join-in-mysql/