SELECT * FROM tasks_flow WHERE (ck_leave_time-ck_depart_time) between 30601000 and 45501000 limit 1;
SELECT * FROM tasks_flow where (ck_leave_time-ck_depart_time)>30601000 and (ck_leave_time-ck_depart_time)<45501000 limit 1;
SELECT * FROM tasks_flow WHERE (ck_leave_time-ck_depart_time) between 30601000 and 45501000 limit 1;
SELECT * FROM tasks_flow where (ck_leave_time-ck_depart_time)>30601000 and (ck_leave_time-ck_depart_time)<45501000 limit 1;