shit-------------mysql没有full join 语句

　弄了好久，结果发现--------　因为mysql没有full join这个东西 

你只能写成

sleect * from A left join B on A.id=B.id
union
select * from A.right join B on A.id=B.id

 

select person.FirstName,person.LastName,orders.OrderNo
from person
LEFT JOIN orders
ON person.id_p=orders.Id_p
UNION
select person.FirstName,person.LastName,orders.OrderNo
from person
RIGHT JOIN orders
ON person.id_p=orders.Id_p;