当我尝试使用sql INNER JOIN查询从3表获取数据时出现错误

Question

In mysql database I've 3 tables which is

1) tutor_signup_form,
2) tutor_signup_edu_psle and
3) tutor_signup_edu_olevel.

Now I'm trying to get all data from those 3 tables. But using following sql query is not working. I'm getting error message

Sql Query I'm using.

$query =  mysql_query("SELECT tutor_signup_form . *, tutor_signup_edu_psle . *, 
  tutor_signup_edu_olevel . * 
FROM tutor_signup_form
  INNER JOIN tutor_signup_edu_psle ON tutor_signup_form.tutor_id =  
  tutor_signup_form.tutor_id   ,    
  INNER JOIN tutor_signup_edu_olevel ON tutor_signup_form.tutor_id = 
  tutor_signup_edu_olevel.tutor_id
WHERE tutor_signup_form.tutor_id = '$tutor_id' ");

Error Message:

Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given in 
D:\software installed\xampp installed\htdocs\tutor\toplevel\edit_tutor.php on line 31

Answer 1

Remove the comma between the INNER JOIN statements:

Change this:

INNER JOIN tutor_signup_edu_psle ON tutor_signup_form.tutor_id =  
tutor_signup_form.tutor_id  ,      
INNER JOIN tutor_signup_edu_olevel ON tutor_signup_form.tutor_id = 
tutor_signup_edu_olevel.tutor_id

to this:

INNER JOIN tutor_signup_edu_psle ON tutor_signup_form.tutor_id =  
tutor_signup_form.tutor_id
INNER JOIN tutor_signup_edu_olevel ON tutor_signup_form.tutor_id = 
tutor_signup_edu_olevel.tutor_id