While connected to MYDB in ij, you can create the table either by issuing individual CREATE TABLE statements, or by using the run command to run an entire set of SQL statements contained in a file.
DDL for the menu application
CREATE TABLE menu.food (id INTEGER GENERATED ALWAYS AS
	IDENTITY PRIMARY KEY,
	name VARCHAR(128), description VARCHAR(1024));

CREATE TABLE menu.prices (id INTEGER, price DECIMAL(5,2), 
	CONSTRAINT prices_fk FOREIGN KEY (id)
	REFERENCES menu.food(id));

CREATE TABLE menu.pictures (id INTEGER, picture BLOB(256K),
	CONSTRAINT pictures_fk FOREIGN KEY (id)
	REFERENCES menu.food(id));