■練習問題１
create table 
  book_table(
  book_id INT,
  book_name VARCHAR(50),
  author_name VARCHAR(50),
  price INT,
  sales_flag INT);

■練習問題 2
Insert into book_table VALUES(10001,'TwoPeace','三田英一郎',420,1);
Insert into book_table VALUES(10002,'名探偵金田二','青山ふみや',460,1);
Insert into book_table VALUES(20001,'坊ちゃま','冬目漱岩',460,1);
Insert into book_table VALUES(30001,'西方見聞録','不明',1000,1);
Insert into book_table VALUES(40010,'吾輩は犬である','冬目漱岩',420,1);


■練習問題 3
SELECT   book_name FROM book_table;
SELECT   author_name FROM book_table;

■練習問題 4
UPDATE book_table 
SET author_name= 'マール＝コー＝ポロ' 
 where  book_id = 30001;
UPDATE  book_table 
SET sales_flag = 0
 where book_id = 30001;

■練習問題 5
SELECT * FROM book_table where sales_flag= 1;

■練習問題 6
SELECT * FROM book_table where author_name ='冬目漱岩' AND price = 420;

■練習問題 7
DELETE FROM book_table where book_id = 20001;