Mysql 以完全联接方式联接两个表

我有两个表

master1

和

master2

：

insert into master1 
(name,address,books,laptop,id,college) values
(ratan,mg road,rajbook,hp,id334,xxx)
(sham,r t nagar,malbook,ibm,id335,xxx)
(ram,shiva road,kalbook,hp,id336,xxx)
(farooq,uday road,rabook,hp,id337,xxx)
(sharukh,kr road,kambook,sony,id338,xxx)

insert into master2
(nam,lappy,idd,coll) values
(ratan,hp,877,ratan college)
(ram,sony,877,ram college)

我想：

select name, address, books, laptop, id, college, nam, lappy
  from master1 LEFT JOIN master2
 where master1.college=master2.coll

输出应为：

(name,address,books,laptop,id,college,nam,lappy
(ratan,mg road,rajbook,hp,id334,xxx,keshav,hp)
(sham,r t nagar,malbook,ibm,id335,xxx,null,null)
(ram,shiva road,kalbook,hp,id336,xxx,null.null)
(farooq,uday road,rabook,hp,id337,xxx,null,null)
(sharukh,kr road,kambook,sony,id338,xxx,ram,sony)

---

其中

不正确，而您在

JOIN

子句的部分缺少

select name,address,books,laptop,id,college,nam,lappy
from master1
left join master2 on master1.college = master2.coll

在

SELECT name,address,books,laptop,id,college,nam,lappy
FROM master1
LEFT OUTER JOIN master2
ON master1.college = master2.coll

你的左连接是错误的，我的格式如下

您的输出如下所示

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问题是什么？你展示了一个没有ON或USING子句的左连接；您需要添加一个。在标题中提到完全加入的原因是什么？这似乎与您期望的输出无关。谢谢您的回复，它帮助了我

Select name
      ,address
      ,books
      ,laptop
      ,id
      ,college
      ,nam
      ,lappy
From master1
LEFT JOIN master2 ON 
      master1.college=master2.coll