text: CREATE TABLE employee
    (id SMALLINT NOT NULL,
    name VARCHAR(32),
    office VARCHAR(32),
    age SMALLINT,
    PRIMARY KEY(id));
  CREATE TABLE book
    (id SMALLINT NOT NULL,
    name VARCHAR(32),
    author VARCHAR(32),
    publisher VARCHAR(32),
    PRIMARY KEY(id));
  CREATE TABLE record
    (book_id SMALLINT,
    employee_id SMALLINT,
    time DATE,
    PRIMARY KEY(book_id,employee_id),
    FOREIGN KEY(book_id)REFERENCES book(id),
    FOREIGN KEY(employee_id)REFERENCES employee(id));
  