[Gnumed-devel] boolean trigger xor behaviour

[syan tan]

gnumed=# update names set active = 't';
UPDATE 2
gnumed=# select * from names;
id | id_identity | active | lastnames | firstnames | preferred | title
----+-------------+--------+-----------+------------+-----------+-------
 4 |           1 | t      | Bill      | Brown      |           |
 5 |           2 | t      | Edna      | Smythe     |           |
(2 rows)

gnumed=# update names set active = 't';
UPDATE 0
gnumed=# select * from names;
id | id_identity | active | lastnames | firstnames | preferred | title
----+-------------+--------+-----------+------------+-----------+-------
 4 |           1 | f      | Bill      | Brown      |           |
 5 |           2 | f      | Edna      | Smythe     |           |
(2 rows)

gnumed=# update names set active = 't';
UPDATE 2
gnumed=# select * from names;
id | id_identity | active | lastnames | firstnames | preferred | title
----+-------------+--------+-----------+------------+-----------+-------
 4 |           1 | t      | Bill      | Brown      |           |
 5 |           2 | t      | Edna      | Smythe     |           |
(2 rows)


Why?