Subtract two integer values from two different sqlite tables

I want to subtract the data in the item_qty_rep column in table repair from the data in the item_qty_st in table Stock. I got the error (java.lang.ArrayIndexOutOfBoundsException:0).

private void update_stockActionPerformed(java.awt.event.ActionEvent evt) {

try{

        String sql = "Insert into Stock (item_name_st, item_qty_st) values (?,?), (?,?), (?,?), (?,?), (?,?), (?,?), (?,?), (?,?), (?,?), (?,?)";
        String sql1 = "UPDATE Stock SET item_qty_st = (SELECT item_qty_st FROM Stock EXCEPT SELECT  item_qty_rep FROM repair)"; //by this part of the code I try to subtract the data in item_qty_rep (which is a column in a table called repair) from the data in item_qty_st ( which is a column in a table called Stock)

        pst = conn.prepareStatement(sql);
        pst = conn.prepareStatement(sql1);

        pst.setString(1,handbrakesLabel.getText());
        pst.setInt(2,Integer.parseInt(handbrakes_qtyAvailable.getText()));


        pst.setString(3, acceleratorLabel15.getText());
        pst.setInt(4,Integer.parseInt(accelerator_qtyAvailable.getText()));

        pst.setString(5,sparkplugsLabel.getText());
        pst.setInt(6,Integer.parseInt(sparkplugs_qtyAvailable.getText()));

        pst.setString(7,doorlocksLabel.getText());
        pst.setInt(8,Integer.parseInt(doorlocks_qtyAvailable.getText()));

        pst.setString(9,propshaftLabel.getText());
        pst.setInt(10,Integer.parseInt(propshaft_qtyAvailable.getText()));

        pst.setString(11,gaugesLabel.getText());
        pst.setInt(12,Integer.parseInt(gauges_qtyAvailable.getText()));

        pst.setString(13,mirrorsLabel.getText());
        pst.setInt(14,Integer.parseInt(mirrors_qtyAvailable.getText()));

        pst.setString(15,seatsLabel.getText());
        pst.setInt(16,Integer.parseInt(seats_qtyAvailable.getText()));

        pst.setString(17,tiresLabel.getText());
        pst.setInt(18,Integer.parseInt(tires_qtyAvailable.getText()));

        pst.setString(19,rimsLabel.getText());
        pst.setInt(20,Integer.parseInt(rims_qtyAvailable.getText()));

        pst.execute();
         JOptionPane.showMessageDialog(null,"Stock Availability");
    }
    catch(Exception e){
        JOptionPane.showMessageDialog(null,e);

    }
   // Update_Table3();
}