Tag nodes from a content type with a taxonomy term

Lets assume that you have a bunch of nodes for a content type and you want to tag them all with the same taxonomy term. First, find the term ID of the relevant term. In example, the term ID is 103 and the content type is "contact".

This is an example if an insert ... select statement.

INSERT INTO term_node (nid, vid, tid)
SELECT nid, vid, 103 as tid
FROM `node`
WHERE TYPE = 'contact'
AND language = 'en'