Update table and trigger in PL/SQL

Question

What I want: When every defaussee are equal to 1 I want to turn them to 0. Here is my table

create table Pile(
    id_carte Int NOT NULL,
    id_pilecarte Int NOT NULL,
    defaussee Int NOT NULL,
    id_personne Int
);

To do that I want to use a trigger on Pile . But I know that I can't modify my table into that trigger.

Here is what I have:

create or replace trigger trg_pile_porte_vide
    after update 
    on Pile
    for each row

    declare
        v_count Int;
    begin
        -- pile tresor
        select count(*) into v_count from (select id_carte from Pile where id_pilecarte = 0 and defaussee = 0 and id_personne is null);
        -- toutes les cartes sont defause
        if(v_count = 0) then
            update Pile set defaussee = 0 where id_pilecarte = 0;
        end if;

        -- pile tresor
        select count(*) into v_count from (select id_carte from Pile where id_pilecarte = 1 and defaussee = 0 and id_personne is null);
        -- toutes les cartes sont defause
        if(v_count = 0) then
            update Pile set defaussee = 0 where id_pilecarte = 1;
        end if;
    end;

Can't somebody help me ?

The error is not only on the UPDATE . Oracle shout from the first SELECT . He doesn't want that I Read/Write on Pile during a trigger on Pile .

Answer 1

Can you try the following?

UPDATE Pile
SET defaussee = 0
WHERE (id_pilecarte, 1) IN (
    SELECT id_pilecarte, MIN(defaussee)
    FROM Pile
    GROUP BY id_pilecarte
    HAVING MIN(defaussee) = 1
);