无法处理MySQL FULL JOIN查询

Question

我想FULL JOIN跟随两张桌子

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 

我用过这个查询:

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

"字段列表"中的未知列"Persons.Name"

MySQL服务器版本是5.5.19,我使用Microsoft Windows7中的命令行客户端

INNER JOIN,RIGHT JOIN和LEFT JOIN为我工作,但我无法执行FULL JOIN.什么是错误,请告诉我,我还是学生.我怎样才能在这里进行全加入？

谢谢!

Answer 1

为了FULL JOIN在mysql 中进行模拟,您需要UNION从两个表中获得右连接和左连接的结果

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演示