FULL OUTER JOIN untuk menggabungkan tabel dengan PostgreSQL

Terinspirasi oleh jawaban lain, tetapi mungkin lebih terorganisir:

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; 

Pemberian:

 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)