INSERT INTO "#__extensions" ("package_id", "name", "type", "element", "folder", "client_id", "enabled", "access", "protected", "locked", "manifest_cache", "params", "custom_data", "ordering", "state")
SELECT 0, 'plg_fields_note', 'plugin', 'note', 'fields', 0, 1, 1, 0, 1, '', '{"class":"alert alert-info","heading":"h4"}', '', -1, 0
WHERE NOT EXISTS (SELECT * FROM "#__extensions" e WHERE e."type" = 'plugin' AND e."element" = 'note' AND e."folder" = 'fields' AND e."client_id" = 0);