他の回答に触発されていますが、おそらくより適切に整理されています:
SELECT *,
brcht + cana + font + nr AS total
FROM (SELECT insee,
annee,
SUM(Coalesce(brcht.nb, 0)) brcht,
SUM(Coalesce(cana.nb, 0)) cana,
SUM(Coalesce(font.nb, 0)) font,
SUM(Coalesce(nr.nb, 0)) nr
FROM brcht
full outer join cana USING (insee, annee)
full outer join font USING (insee, annee)
full outer join nr USING (insee, annee)
GROUP BY insee,
annee) t
ORDER BY insee,
annee;
与える:
insee | annee | brcht | cana | font | nr | total
--------+-------+-------+------+------+----+-------
036223 | 2013 | 0 | 0 | 0 | 1 | 1
036223 | 2014 | 0 | 0 | 0 | 1 | 1
036223 | 2017 | 0 | 1 | 0 | 0 | 1
086001 | 2013 | 0 | 0 | 0 | 1 | 1
086001 | 2014 | 0 | 0 | 0 | 2 | 2
086001 | 2015 | 0 | 0 | 0 | 4 | 4
086001 | 2016 | 0 | 2 | 0 | 2 | 4
(7 rows)