您必须加入两次.为表格指定不同的别名，以便您区分它们.

You have to join twice. Give the table different aliases so you can distinguish them.

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