dbtlr

+----+-------+-------------------------------+
| id | name  | total_cold_inquiries_received |
+----+-------+-------------------------------+
|  2 | Mike  |                             1 |
|  4 | Bill  |                             2 |
|  5 | Kate  |                             1 |
|  6 | Sue   |                             1 |
|  7 | Linda |                             2 |
|  8 | Mary  |                             1 |
+----+-------+-------------------------------+

dbtlr

+----------------+-------+---------------------+---------------------+
| sender_user_id | name  | num_users_contacted | num_users_responded |
+----------------+-------+---------------------+---------------------+
|              3 | Greg  |                   1 |                   1 |
|              1 | John  |                   4 |                   0 |
|              7 | Linda |                   1 |                   1 |
|              6 | Sue   |                   2 |                   2 |
+----------------+-------+---------------------+---------------------+

dbtlr

-- Setup some tables.
CREATE TABLE `users` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1;

CREATE TABLE `internal_messages` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `owner_user_id` int(11) DEFAULT NULL,