mysql - 无法处理 MySQL FULL JOIN 查询

Question

我想在两个表之后FULL JOIN

表 1:人员

P_Id      Name            
 1         A        
 2         B       
 3         C
 4         D
 5         E 

表 2:发票

  Id       P_Id            
 111        3        
 112        3       
 113        1
 114        1
 115       15 

我使用了这个查询:

SELECT Persons.Name, Persons.P_Id, Invoice.Id
FROM Persons
FULL JOIN Invoice
ON Persons.P_Id=Invoice.P_Id
ORDER BY Persons.Name

但这会产生错误

Unknown column 'Persons.Name' in 'Field list'

MySQL 服务器版本是 5.5.19，我在 Microsoft Windows7 中使用命令行客户端

INNER JOIN、RIGHT JOIN 和 LEFT JOIN 对我有用，但我无法执行 FULL JOIN。错误是什么请告诉我我还是个学生。我如何在这里执行 FULL JOIN？

谢谢!

Answer 1

为了在mysql中模拟FULL JOIN，需要UNION两张表的Right Join和Left Join的结果

SELECT  Persons.Name, Persons.P_Id, Invoice.Id
FROM    Persons
        LEFT JOIN Invoice
            ON Persons.P_Id=Invoice.P_Id
UNION
SELECT  Persons.Name, Persons.P_Id, Invoice.Id
FROM    Invoice
        LEFT JOIN Persons
            ON Persons.P_Id=Invoice.P_Id

• SQLFiddle Demo