新建一个名为 library 的数据库，包含 book、reader 两张表。

CREATE TABLE book
 (
book_id SMALLINT(10),
book_name VARCHAR(20) NOT NULL,
book_price CHAR(10) NOT NULL
);
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 INSERT INTO book (book_id,book_name,book_price) VALUES(01,'Java',40);
 INSERT INTO book VALUES(02,'c++',40);
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CREATE TABLE reader
 (
reader_id SMALLINT(10),
reader_name VARCHAR(20) NOT NULL,
reader_sex CHAR(10) NOT NULL,
reader_age INT(2) NOT NULL
);
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INSERT INTO reader(reader_id,reader_name,reader_sex,reader_age) VALUES(001,'Anna','female',18);

INSERT INTO reader VALUES(002,'Jack','male',20);
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