CREATE TABLE book (

  isbn VARCHAR (50) PRIMARY KEY,

  book_name VARCHAR (100),

  price INT

) ;

CREATE TABLE book_stock (

  isbn VARCHAR (50) PRIMARY KEY,

  stock INT,

  CHECK (stock > 0)

) ;

CREATE TABLE account (

  username VARCHAR (50) PRIMARY KEY,

  balance INT,

  CHECK (balance > 0)

) ;

INSERT INTO account (`username`,`balance`) VALUES (‘Tom’,100000);

INSERT INTO account (`username`,`balance`) VALUES (‘Jerry’,150000);

INSERT INTO book (`isbn`,`book_name`,`price`) VALUES (‘ISBN-001′,’book01’,100);

INSERT INTO book (`isbn`,`book_name`,`price`) VALUES (‘ISBN-002′,’book02’,200);

INSERT INTO book (`isbn`,`book_name`,`price`) VALUES (‘ISBN-003′,’book03’,300);

INSERT INTO book (`isbn`,`book_name`,`price`) VALUES (‘ISBN-004′,’book04’,400);

INSERT INTO book (`isbn`,`book_name`,`price`) VALUES (‘ISBN-005′,’book05’,500);

INSERT INTO book_stock (`isbn`,`stock`) VALUES (‘ISBN-001’,1000);

INSERT INTO book_stock (`isbn`,`stock`) VALUES (‘ISBN-002’,2000);

INSERT INTO book_stock (`isbn`,`stock`) VALUES (‘ISBN-003’,3000);

INSERT INTO book_stock (`isbn`,`stock`) VALUES (‘ISBN-004’,4000);

INSERT INTO book_stock (`isbn`,`stock`) VALUES (‘ISBN-005’,5000);