Make migrations runnable with 'mysql < *.sql'

week_8/examples/posts_and_comments/20200224T184700-create_tables.sql

--- sudo mysql -u root weblog < 20200224T184700-create_tables.sql
+-- sudo mysql -u root < 20200224T184700-create_tables.sql
+
+use weblog;
 
 create table posts (
   id INT AUTO_INCREMENT PRIMARY KEY,

week_8/examples/posts_and_comments/20200224T184900-insert_posts_and_comments.sql

--- sudo mysql -u root weblog < 20200224T184900-insert_posts_and_comments.sql
+-- sudo mysql -u root < 20200224T184900-insert_posts_and_comments.sql
 
 -- text from http://shakespeare.mit.edu/tempest/full.html
 
+use weblog;
+
 insert into posts (id, slug, title, body) values (
   1,
   "act_1_scene_1",

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

@@ -13,6 +13,8 @@
 --   FOREIGN KEY(post_id) REFERENCES posts(id)
 -- );
 
+use weblog;
+
 create table posts_and_comments (
     id INT AUTO_INCREMENT PRIMARY KEY,
     body TEXT,