mysql> SELECT *,CURRENT_DATE () as fechaActual,(DAY (CURRENT_DATE())- DAY(fechaEntrega)) as RetrasoEnDias from ticket ;
+-----------+----------+-------------+-------------+--------------+--------+-------------+---------------+
| id_ticket | id_socio | id_empleado | fechaSalida | fechaEntrega | precio | fechaActual | RetrasoEnDias |
+-----------+----------+-------------+-------------+--------------+--------+-------------+---------------+
|         1 |       15 |         315 | 2012-02-01  | 2012-02-04   |     25 | 2012-02-06  |             2 |
+-----------+----------+-------------+-------------+--------------+--------+-------------+---------------+
1 row in set (0.00 sec)