mysql> select a.host_object_id,a.display_name,a.address,b.hostgroup_id,b.alias from nagios_hosts a,nagios_hostgroups b,nagios_hostgroup_members c where c.host_object_id=a.host_object_id and c.hostgroup_id=b.hostgroup_id order by b.hostgroup_id;
+----------------+--------------+----------------+--------------+--------------------------+
| host_object_id | display_name | address        | hostgroup_id | alias                    |
+----------------+--------------+----------------+--------------+--------------------------+
|              1 | localhost    | 127.0.0.1      |          246 | All Servers              |
|              2 | nagios-host  | 192.168.21.103 |          246 | All Servers              |
|            223 | zcliushh     | 192.168.21.109 |          246 | All Servers              |
|              1 | localhost    | 127.0.0.1      |          247 | Debian GNU/Linux Servers |
|              1 | localhost    | 127.0.0.1      |          248 | HTTP servers             |
|              2 | nagios-host  | 192.168.21.103 |          249 | sa Servers               |
|              1 | localhost    | 127.0.0.1      |          250 | SSH servers              |
+----------------+--------------+----------------+--------------+--------------------------+
7 rows in set (0.00 sec)

mysql> select * from nagios_hostgroups;
+--------------+-------------+-------------+---------------------+--------------------------+
| hostgroup_id | instance_id | config_type | hostgroup_object_id | alias                    |
+--------------+-------------+-------------+---------------------+--------------------------+
|          246 |           1 |           1 |                 211 | All Servers              |
|          247 |           1 |           1 |                 212 | Debian GNU/Linux Servers |
|          248 |           1 |           1 |                 213 | HTTP servers             |
|          249 |           1 |           1 |                 214 | sa Servers               |
|          250 |           1 |           1 |                 215 | SSH servers              |
+--------------+-------------+-------------+---------------------+--------------------------+
5 rows in set (0.00 sec)

mysql> select * from nagios_hostgroup_members;
+---------------------+-------------+--------------+----------------+
| hostgroup_member_id | instance_id | hostgroup_id | host_object_id |
+---------------------+-------------+--------------+----------------+
|                 311 |           1 |          246 |              1 |
|                 312 |           1 |          246 |              2 |
|                 313 |           1 |          246 |            223 |
|                 314 |           1 |          247 |              1 |
|                 315 |           1 |          248 |              1 |
|                 316 |           1 |          249 |              2 |
|                 317 |           1 |          250 |              1 |
+---------------------+-------------+--------------+----------------+
7 rows in set (0.00 sec)

mysql> select * from nagios_hosts;

| host_object_id | alias             | display_name | address        |