Código PHP:
$sQl_mostrar1 = 'SELECT a.opb_id,c.grp_nombre_comercial,b.opb_ctabco_cve,b.opb_f_descto,b.opb_f_operacion,
b.opb_estatus_cve,SUM(a.rpt_importe) AS rpt,SUM(a.opb_importe) AS opb,SUM(a.ajuste_importe)
AS ajuste,SUM(a.rpt_importe) - SUM(a.opb_importe)+ SUM(a.ajuste_importe) AS Dif
FROM view_concilia AS a, krt30_opbanco AS b, orig10_agrupacion AS c
WHERE a.opb_id = b.opb_id,'.$where.' AND c.grp_id = b.grp_id
GROUP BY a.opb_id, b.opb_id, c.grp_nombre_comercial, b.opb_ctabco_cve, b.opb_f_descto, b.opb_f_operacion,
b.opb_estatus_cve ORDER BY b.opb_id LIMIT '.$RegistrosAEmpezar.','.$RegistrosAMostrar.';';
$eXe_mostrar = mysql_query($sQl_mostrar1) or die($sQl_mostrar. "<br>" . mysql_error());