Question

Is this statement correct syntactically:

$query = "SELECT matric_no session course_name
              FROM main_table session
              WHERE main_table.matric_no = '$_POST[matric_no]'
                  AND session.session_name = '$_SESSION[session]'
                  AND session.course_name =  '$_SESSION[course_name]'";
$result = mysql_query($query) ;                       
$duplicates = mysql_num_rows($result);

if ($duplicates = 1) {
    echo "you have dis in the database";
};

Answer 1

there are some syntax problems in your query

if main_table and session are two different tables then it should be something like this.

"SELECT main_table.matric_no, session.course_name
          FROM main_table, session
          WHERE main_table.matric_no = '$_POST[matric_no]'
              AND session.session_name = '$_SESSION[session]'
              AND session.course_name =  '$_SESSION[course_name]'"