Permet de poster un commentaire sans être connecté

tables.sql

@@ -20,7 +20,9 @@ CREATE TABLE comment (
     news_id INT NOT NULL,
     publication_date TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     content TEXT NOT NULL,
-    author_id INT NOT NULL,
+    author_id INT NULL,
+    author_name VARCHAR(32) NULL,
+    CONSTRAINT either_authors CHECK ((author_id IS NULL) != (author_name IS NULL)),
     FOREIGN KEY (news_id) REFERENCES news(id_news)
         ON DELETE CASCADE,
     FOREIGN KEY (author_id) REFERENCES registered_user(id_user)