diff --git a/resources/functions/vote/vote.sql b/resources/functions/vote/vote.sql
new file mode 100644
index 0000000..3a11f9e
--- /dev/null
+++ b/resources/functions/vote/vote.sql
@@ -0,0 +1,35 @@
+create or replace function vote(reference regclass, _target_id uuid, _citizen_id uuid, _note int, _anonymous bool default true) returns void
+    language plpgsql as
+$$
+begin
+    if reference = 'article'::regclass then
+        insert into vote_for_article (citizen_id, target_id, note, anonymous)
+        values (_citizen_id, _target_id, _note, _anonymous)
+        on conflict (citizen_id, target_id) do update set
+          note = excluded.note,
+          anonymous = excluded.anonymous;
+    elseif reference = 'constitution'::regclass then
+        insert into vote_for_constitution (citizen_id, target_id, note, anonymous)
+        values (_citizen_id, _target_id, _note, _anonymous)
+        on conflict (citizen_id, target_id) do update set
+          note = excluded.note,
+          anonymous = excluded.anonymous;
+    elseif reference = 'comment_on_article'::regclass then
+        insert into vote_for_comment_on_article (citizen_id, target_id, note, anonymous)
+        values (_citizen_id, _target_id, _note, _anonymous)
+        on conflict (citizen_id, target_id) do update set
+          note = excluded.note,
+          anonymous = excluded.anonymous;
+    elseif reference = 'comment_on_constitution'::regclass then
+        insert into vote_for_comment_on_constitution (citizen_id, target_id, note, anonymous)
+        values (_citizen_id, _target_id, _note, _anonymous)
+        on conflict (citizen_id, target_id) do update set
+          note = excluded.note,
+          anonymous = excluded.anonymous;
+    else
+        raise exception '% no implemented', reference::text;
+    end if;
+end;
+$$;
+
+-- drop function if exists vote(regclass,uuid,uuid,integer,boolean);
\ No newline at end of file
diff --git a/resources/sql/migrations/0000-init_schema.up.sql b/resources/sql/migrations/0000-init_schema.up.sql
index 1500e70..cee2c62 100644
--- a/resources/sql/migrations/0000-init_schema.up.sql
+++ b/resources/sql/migrations/0000-init_schema.up.sql
@@ -256,35 +256,44 @@ create table vote
     anonymous boolean default true not null,
     note      int                  not null check ( note >= -1 and note <= 1 ),
     foreign key (citizen_id) references citizen (id),
-    primary key (id)
+    primary key (id),
+    unique (citizen_id, target_id)
 ) inherits (extra);
 
 create table vote_for_article
 (
+    target_reference regclass default 'article'::regclass not null,
     foreign key (target_id) references article (id),
     foreign key (citizen_id) references citizen (id),
-    primary key (id)
+    primary key (id),
+    unique (citizen_id, target_id)
 ) inherits (vote);
 
 create table vote_for_constitution
 (
+    target_reference regclass default 'constitution'::regclass not null,
     foreign key (target_id) references constitution (id),
     foreign key (citizen_id) references citizen (id),
-    primary key (id)
+    primary key (id),
+    unique (citizen_id, target_id)
 ) inherits (vote);
 
 create table vote_for_comment_on_article
 (
+    target_reference regclass default 'comment_on_article'::regclass not null,
     foreign key (target_id) references comment_on_article (id),
     foreign key (citizen_id) references citizen (id),
-    primary key (id)
+    primary key (id),
+    unique (citizen_id, target_id)
 ) inherits (vote);
 
 create table vote_for_comment_on_constitution
 (
-    primary key (id),
+    target_reference regclass default 'comment_on_constitution'::regclass not null,
     foreign key (target_id) references comment_on_constitution (id),
-    foreign key (target_id) references citizen (id)
+    foreign key (citizen_id) references citizen (id),
+    primary key (id),
+    unique (citizen_id, target_id)
 ) inherits (vote);
 
 -- Stats
diff --git a/resources/tests/vote.sql b/resources/tests/vote.sql
new file mode 100644
index 0000000..172c536
--- /dev/null
+++ b/resources/tests/vote.sql
@@ -0,0 +1,82 @@
+do
+$$
+declare
+    created_user     json  := '{"username": "george", "plain_password": "azerty"}';
+    _citizen_id      uuid;
+    created_citizen json := $json$
+    {
+      "name": {
+        "first_name": "George",
+        "last_name": "MICHEL"
+      },
+      "birthday": "2001-01-01"
+    }
+    $json$;
+    created_article  json := $json$
+    {
+      "version_id": "933b6a1b-50c9-42b6-989f-c02a57814ef9",
+      "title": "Love the world",
+      "annonymous": false,
+      "content": "bla bal bla",
+      "tags": [
+        "love",
+        "test"
+      ]
+    }
+    $json$;
+begin
+    -- insert user for context
+    call insert_user(created_user);
+    created_citizen := jsonb_set(created_citizen::jsonb, '{user}'::text[], jsonb_build_object('id', created_user->>'id'), true)::json;
+
+    -- insert new citizen for context
+    call upsert_citizen(created_citizen);
+    _citizen_id := created_citizen->>'id';
+    created_article := jsonb_set(created_article::jsonb, '{created_by}'::text[], jsonb_build_object('id', _citizen_id::text), true)::json;
+    assert created_article#>>'{created_by, id}' = _citizen_id::text, format('citizenId in article must be the same as citizen, %s != %s', created_article#>>'{created_by, id}', _citizen_id::text);
+    -- upsert article
+    call upsert_article(created_article);
+
+
+    perform vote(
+        reference => 'article'::regclass,
+        _target_id => (created_article->>'id')::uuid,
+        _citizen_id => _citizen_id,
+        _note => 1
+    );
+    assert (select count(*) = 1 from vote_for_article), 'vote must be inserted';
+    assert (select note = 1 from vote_for_article limit 1), 'vote must be equal to 1';
+
+    perform vote(
+        reference => 'article'::regclass,
+        _target_id => (created_article->>'id')::uuid,
+        _citizen_id => _citizen_id,
+        _note => -1
+    );
+    assert (select count(*) = 1 from vote_for_article), 'vote must be inserted';
+    assert (select note = -1 from vote_for_article limit 1), 'vote must be equal to -1';
+
+    begin
+        perform vote(
+            reference => 'article'::regclass,
+            _target_id => (created_article->>'id')::uuid,
+            _citizen_id => _citizen_id,
+            _note => -10
+        );
+        assert false, 'vote must be throw exception if note is not -1, 0 or 1';
+    exception when check_violation then
+    end;
+
+
+    -- delete vote and context
+    delete from vote;
+    delete from article;
+    delete from citizen;
+    delete from "user";
+
+    raise notice 'vote test pass';
+end;
+$$;
+
+
+-- select uuid_generate_v4();
\ No newline at end of file