mysql INNER JOIN 显示不正确的信息

Question

我在尝试对 2 个表执行内部联接时遇到问题 这是表格

addressBookUsers[
userid int PK Auto increment
username VARCHAR
password VARCHAR
]

addressbook[
aid int PK Auto Increment 
address VAR CHAR
uId int FK REFRENCE(userid) FROM addressBookUsers
]

这是一些示例数据

addressBookUsers
userid   username  password  
1        fred      21434234 
2        al        3243254 
3        web       fdsafdr


addressbook
aid   address  uId
1     2314     1
2     ererw    1
3     edfwrf   2
4     dfadf    2

这是我正在运行的查询。当我运行它时，所有数据都会打印到表中，而不仅仅是特定用户的数据

$result = mysql_query("SELECT * FROM addressbook INNER JOIN addressBookUsers ON addressbook.uId = addressBookUsers.userid ");

Answer 1

您需要指定UserID

$result = mysql_query("SELECT * FROM addressbook INNER JOIN addressBookUsers ON addressbook.uId = addressBookUsers.userid  and addressbook.uId=". $UserID. ";)

或

$result = mysql_query("SELECT * FROM addressbook INNER JOIN addressBookUsers ON addressbook.uId = addressBookUsers.userid  where addressbook.uId=". $UserID. ";)

编辑：

因为内连接只提供您指定的 ON 列集。所以它会给所有匹配 行属于addressBookUsers.userid for addressbook.uid 所以你需要通过 where 子句或使用 join 过滤