用PHP中的内部联接更新查询

Question

I have written query to update two table with inner join:

function update($student_id,$data){
    $email=$data['Email'];
     $firstname=$data['FirstName'];

   $sql= "update users u
    INNER JOIN students s ON u.id= s.user_id
    SET u.Email='$email',
        s.Email='$email',
        u.FirstName='$firstname'
    WHERE s.id='$student_id'";
     $result = $this->db->query($sql);
        return $result;
} 

well I m not getting any error but im not able to update table in database.

Answer 1

Try this..

UPDATE u    
  SET u.Email='$email',
       s.Email='$email',
       u.FirstName='$firstname'  
from users u INNER JOIN  students ON s u.id= s.user_id  WHERE s.id='$student_id'