SELECT  sensor_instances.*,
				row_to_json((SELECT d
					FROM  (SELECT groups.*) d
				)) AS group,
				row_to_json((SELECT a
					FROM (SELECT addresses.*) a
				)) AS currentAddress,
				(
				 SELECT JSON_AGG(src)
				 FROM (SELECT sensor_parameters.*
				   FROM sensor_parameters
				   WHERE sensor_parameters.sensortype = sensor_instances.sensortype
				 ) src
				) AS parameters
			FROM sensor_instances
			LEFT JOIN groups ON groups.id = sensor_instances.groupid 
			LEFT JOIN addresses ON sensor_instances.addressid = addresses.id
			WHERE sensor_instances.id IN (439)