I am making a query like this:
$b1 = $_REQUEST['code'].'A'; //letter 'A' is concatenated to $_REQUEST['code']
$a = $_REQUEST['num'];
echo $b1.$a;
$sql = "SELECT '".$b1."' FROM student_record1 WHERE id=".$a;
$result = mysql_query($sql);
if(!$result)
{
echo '<p id="signup">Something went wrong.</p>';
}
else
{
$str = $row[0]
echo $str;
}
Here $b1
and $a
are getting values from another page. The 'echo' in the third line is giving a correct result. And I am not getting any error in SQL. Instead, I am not getting any result from the SQL query. I mean echo at the last line.