FULLSTÄNDIG YTTRE JOIN för att slå samman tabeller med PostgreSQL

Inspirerad av andra svar, men kanske bättre organiserad:

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; 

Ge:

 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)