Finish example

week_8/examples/posts_and_comments/20210303T143000-create_combines_table.sql

@@ -17,9 +17,9 @@ use weblog;
 
 create table posts_and_comments (
     id INT AUTO_INCREMENT PRIMARY KEY,
-    body TEXT,
-    slug VARCHAR(30) NOT NULL,
-    title VARCHAR(255) NOT NULL,
+    body TEXT NOT NULL,
+    slug VARCHAR(30),
+    title VARCHAR(255),
     post_id INT,
     author VARCHAR(30)
-)
+);

week_8/examples/posts_and_comments/20210303T145000-copy_old_data_over.sql

+-- migrate the posts first
+
+use weblog;
+
+insert into posts_and_comments(id, body, slug, title)
+    SELECT id, body, slug, title from posts;
+
+-- then migrate the comments
+
+insert into posts_and_comments(body, author, post_id)
+    select body, author, post_id from comments;