将 2 个字段加入另一个表

Question

如何将表 1 中的两个字段连接到表 2？

我在下面有这个代码，我如何将用户表中的字段“手机号码”、“名字”和“姓氏”加入到 user_address 表中？

 $query = "SELECT * FROM user_address WHERE user_id IN 
  (SELECT id FROM user WHERE email = '".$email."')";

Answer 1

$query = "SELECT a.*,b.mobilenumber,b.firstname,b.lastname 
          FROM user_address a 
            left join user b on a.user_id=b.user_id 
          WHERE a.user_id IN 
            (SELECT id FROM user WHERE email = '".$email."')";

Answer 2

您可以改用LEFT JOIN并从两个表中选择属性。 例子：

$query = "SELECT ua.*, 
   u.mobilenumber, 
   u.firstname, 
   u.lastname 
FROM   user_address ua 
   LEFT JOIN USER u 
          ON u.id = ua.user_id 
WHERE u.email = '$email'";