Postgresql script example UPDATE table with INNER JOIN

update_with_join.sql

WITH a AS (
	SELECT sportsmen_id FROM chalenge_results r
	INNER JOIN
		chalenge_chalengesporter s 
	ON r.sportsmen_id = s.id
	WHERE date_part('year', s.date_req) = 2017
)

UPDATE chalenge_results as c
SET chalenge_id = 2
FROM a WHERE c.sportsmen_id = a.sportsmen_id