Structuring one sql query above another in php

Im trying to structure more than one sql query over another so that I could produce the result in a pdf (using tcpdf). I cant use joins in this case because i have 3 columns(in the table i want to produce) that have different where conditions for each. Ive tried putting one query over the other but get the following error.

Fatal error: Uncaught Error: Call to undefined method mysqli::query1() in C

This is my erroneous code. Could someone please show me where ive gone wrong with structuring this?

function fetch_data()  

 {  
      $output = '';  
      include ('dbcon.php'); 

      $query1 = $conn-> query1("SELECT empfname, emplname from employee");
      while ($row1 = $query1 -> fetch_array()){

         $query = $conn -> query("SELECT count(1) from tasks WHERE pf = '1' and stats ='0' ");  
         while($row = $query -> fetch_array())  
         {  

            $number = $row[0];     
            $output .= '<tr>  
                            
                          <td>'.$number.'</td>  
                          <td>'.$row1["empfname"].'</td>
                          <td>'.$row1["emplname"].'</td>
                 </tr>  
                          ';  
          } 
     } 
 return $output;  
 }