I've the dump of civicrm_mailing_event_delivered table. It has 3 fields - id, event_queue_id and timestamp.
By looking at this table, how do I find the mails belonging to one particular mailing? Why is it wrong to assume that every mail in a mailing is sent at the same time? When I do Administer->Settings->Schedule Jobs-> Send Scheduled mailings -> Execute now, it sends all the mails in the mailing at the same time.