diff --git a/PostgreSQL/tables/tables.sql b/PostgreSQL/tables/tables.sql
index b9d7279..276cd25 100644
--- a/PostgreSQL/tables/tables.sql
+++ b/PostgreSQL/tables/tables.sql
@@ -188,13 +188,121 @@ CREATE TABLE varier
 -- Foreign Keys
 -- ============================================================================
 
+ALTER TABLE acheter
+    ADD CONSTRAINT fk1__acheter FOREIGN KEY (id_membre)
+        REFERENCES membres (id_membre);
 
+ALTER TABLE acheter
+    ADD CONSTRAINT fk2__acheter FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
 
+ALTER TABLE avoir_motif
+    ADD CONSTRAINT fk1__avoir_motif FOREIGN KEY (id_piece)
+        REFERENCES piecess (id_piece);
 
+ALTER TABLE avoir_motif
+    ADD CONSTRAINT fk2__avoir_motif FOREIGN KEY (id_motif)
+        REFERENCES motifs (id_motif);
 
+ALTER TABLE colorer
+    ADD CONSTRAINT fk1__colorer FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
 
+ALTER TABLE colorer
+    ADD CONSTRAINT fk2__colorer FOREIGN KEY (id_couleur)
+        REFERENCES couleurs (id_couleur);
 
+ALTER TABLE construire
+    ADD CONSTRAINT fk1__construire FOREIGN KEY (id_boite)
+        REFERENCES boites (id_boite);
 
+ALTER TABLE construire
+    ADD CONSTRAINT fk2__construire FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE contenir
+    ADD CONSTRAINT fk2__contenir FOREIGN KEY (id_boite)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE enregistrer
+    ADD CONSTRAINT fk1__enregistrer FOREIGN KEY (id_boite)
+        REFERENCES boites (id_boite);
+
+ALTER TABLE enregistrer
+    ADD CONSTRAINT fk2__enregistrer FOREIGN KEY (id_membre)
+        REFERENCES membres (id_membre);
+
+ALTER TABLE etre
+    ADD CONSTRAINT fk1__etre FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE etre_complexe
+    ADD CONSTRAINT fk1__etre_complexe FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE etre_complexe
+    ADD CONSTRAINT fk2__etre_complexe FOREIGN KEY (id_piece_2)
+        REFERENCES pieces (id_piece_2);
+
+ALTER TABLE etre_forme
+    ADD CONSTRAINT fk1__etre_forme FOREIGN KEY (id_forme)
+        REFERENCES formes (id_forme);
+
+ALTER TABLE etre_forme
+    ADD CONSTRAINT fk2__etre_forme FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE fils
+    ADD CONSTRAINT fk1__fils FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE illustrations
+    ADD CONSTRAINT fk1__illustrations FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE messages
+    ADD CONSTRAINT fk1__messages FOREIGN KEY (id_fil)
+        REFERENCES fils (id_fil);
+
+ALTER TABLE messages
+    ADD CONSTRAINT fk2__messages FOREIGN KEY (id_message_2)
+        REFERENCES messages (id_message_2);
+
+ALTER TABLE necessiter
+    ADD CONSTRAINT fk1__necessiter FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE necessiter
+    ADD CONSTRAINT fk2__necessiter FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE noter
+    ADD CONSTRAINT fk1__noter FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE noter
+    ADD CONSTRAINT fk2__noter FOREIGN KEY (id_membre)
+        REFERENCES membres (id_membre);
+
+ALTER TABLE perdre
+    ADD CONSTRAINT fk1__perdre FOREIGN KEY (id_membre)
+        REFERENCES membres (id_membre);
+
+ALTER TABLE perdre
+    ADD CONSTRAINT fk2__perdre FOREIGN KEY (id_boite)
+        REFERENCES boites (id_boite);
+
+ALTER TABLE perdre
+    ADD CONSTRAINT fk3__perdre FOREIGN KEY (id_piece)
+        REFERENCES pieces (id_piece);
+
+ALTER TABLE varier
+    ADD CONSTRAINT fk1__varier FOREIGN KEY (id_modele)
+        REFERENCES modeles (id_modele);
+
+ALTER TABLE varier
+    ADD CONSTRAINT fk2__varier FOREIGN KEY (id_modele_2)
+        REFERENCES modeles (id_modele_2);
 
 -- ============================================================================
 -- Indexes