How to Identify Zabbix Hosts and Templates Using Multiple ID Columns?

Identifying Hosts and Templates in a Zabbix Table with Multiple ID Columns

In the context of a Zabbix setup, where hosts and templates share the same table and are identified by their respective IDs, locating the specific hosts that utilize particular templates can be a challenging task. To address this, it's essential to leverage the hosts_templates table, which explicitly defines the relationships between hosts and templates.

The hosts table contains the following pertinent columns:

• hostid: Unique ID for both hosts and templates
• name: Display name for hosts and templates

Meanwhile, the hosts_templates table includes the following columns:

• host_template_id: Unique ID for the relationship between a host and a template
• hostid: ID of the host involved in the relationship
• templateid: ID of the template associated with the relationship

The goal is to retrieve the names of hosts and templates based on their IDs in the hosts_templates table. However, a straightforward merge using the hostid column will result in duplicate entries.

To circumvent this issue, the query should join the hosts table twice, using different aliases for each join. By doing so, we can differentiate between the host and template names in the results:

SELECT h1.name AS host_name, h2.name AS template_name
FROM hosts_template AS t
JOIN hosts AS h1 ON t.hostid = h1.hostid
JOIN hosts AS h2 ON t.hosttemplateid = h2.hostid

This refined query successfully retrieves the desired data, providing a clear view of which hosts utilize which templates within the Zabbix environment.

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