There is no FULL OUTER JOIN
in MySQL. See 7.2.12. Outer Join Simplification and 12.2.8.1. JOIN Syntax:
You can emulate
FULL OUTER JOIN
using
UNION (from MySQL 4.0.0 on):with two tables t1, t2:
SELECT * FROM t1 LEFT JOIN t2 ON t1.id = t2.id UNION SELECT * FROM t1 RIGHT JOIN t2 ON t1.id = t2.id
with three tables t1, t2, t3:
SELECT * FROM t1 LEFT JOIN t2 ON t1.id = t2.id LEFT JOIN t3 ON t2.id = t3.id UNION SELECT * FROM t1 RIGHT JOIN t2 ON t1.id = t2.id LEFT JOIN t3 ON t2.id = t3.id UNION SELECT * FROM t1 RIGHT JOIN t2 ON t1.id = t2.id RIGHT JOIN t3 ON t2.id = t3.id