mysql> ALTER TABLE book_table MODIFY COLUMN book_id INT COMMENT '書籍ID'; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE book_table MODIFY COLUMN book_name VARCHAR(50) COMMENT '書籍名'; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE book_table MODIFY COLUMN author_name VARCHAR(50) COMMENT '著者'; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE book_table MODIFY COLUMN price INT COMMENT '価格'; Query OK, 0 rows affected (0.04 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> ALTER TABLE book_table MODIFY COLUMN sales_flag INT COMMENT '販売有無'; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0 mysql> INSERT INTO book_table VALUES(10001, TwoPeace, 三田英一郎, 420, 1); ERROR 1054 (42S22): Unknown column 'TwoPeace' in 'field list' mysql> INSERT INTO book_table VALUES(10001, 'TwoPeace', '三田英一郎', 420, 1); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO book_table VALUES(10002, '名探偵金田二', '青山ふみや', 460, 1); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO book_table VALUES(10003, '坊ちゃま', '冬目漱岩', 460, 1); Query OK, 1 row affected (0.00 sec) mysql> UPDATE book_table SET book_id = 20001 WHERE 10003; Query OK, 3 rows affected (0.01 sec) Rows matched: 3 Changed: 3 Warnings: 0 mysql> SELECT * FROM book_table; +---------+--------------+-------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+--------------+-------------+-------+------------+ | 20001 | TwoPeace | 三田英一郎 | 420 | 1 | | 20001 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 20001 | 坊ちゃま | 冬目漱岩 | 460 | 1 | +---------+--------------+-------------+-------+------------+ 3 rows in set (0.00 sec) mysql> UPDATE book_table SET book_id = 10001 WHERE price = 420; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> UPDATE book_table SET book_id = 10002 WHERE author_name = '青山ふみや'; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> ^C mysql> SELECT * FROM book_table; +---------+--------------+-------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+--------------+-------------+-------+------------+ | 10001 | TwoPeace | 三田英一郎 | 420 | 1 | | 10002 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 20001 | 坊ちゃま | 冬目漱岩 | 460 | 1 | +---------+--------------+-------------+-------+------------+ 3 rows in set (0.00 sec) mysql> INSERT INTO book_table VALUES(30001, '西方見聞録', '不明', 1000, 1); Query OK, 1 row affected (0.00 sec) mysql> INSERT INTO book_table VALUES(40010, '吾輩は犬である', '冬目漱岩', 420, 1); Query OK, 1 row affected (0.00 sec) mysql> SELECT * FROM book_table; +---------+----------------+-------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+----------------+-------------+-------+------------+ | 10001 | TwoPeace | 三田英一郎 | 420 | 1 | | 10002 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 20001 | 坊ちゃま | 冬目漱岩 | 460 | 1 | | 30001 | 西方見聞録 | 不明 | 1000 | 1 | | 40010 | 吾輩は犬である | 冬目漱岩 | 420 | 1 | +---------+----------------+-------------+-------+------------+ 5 rows in set (0.00 sec) mysql> SELECT book_name,author_name FROM book_table; +----------------+-------------+ | book_name | author_name | +----------------+-------------+ | TwoPeace | 三田英一郎 | | 名探偵金田二 | 青山ふみや | | 坊ちゃま | 冬目漱岩 | | 西方見聞録 | 不明 | | 吾輩は犬である | 冬目漱岩 | +----------------+-------------+ 5 rows in set (0.00 sec) mysql> UPDATE book_table SET author_name = 'マール＝コー＝ポロ' WHERE book_id = 30001; Query OK, 1 row affected (0.00 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> UPDATE book_table SET sales_flag = 0 WHERE book_id = 30001; Query OK, 1 row affected (0.01 sec) Rows matched: 1 Changed: 1 Warnings: 0 mysql> SELECT * FROM book_table; +---------+----------------+--------------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+----------------+--------------------+-------+------------+ | 10001 | TwoPeace | 三田英一郎 | 420 | 1 | | 10002 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 20001 | 坊ちゃま | 冬目漱岩 | 460 | 1 | | 30001 | 西方見聞録 | マール＝コー＝ポロ | 1000 | 0 | | 40010 | 吾輩は犬である | 冬目漱岩 | 420 | 1 | +---------+----------------+--------------------+-------+------------+ 5 rows in set (0.00 sec) mysql> SELECT * FROM book_table where sales_flag = 1; +---------+----------------+-------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+----------------+-------------+-------+------------+ | 10001 | TwoPeace | 三田英一郎 | 420 | 1 | | 10002 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 20001 | 坊ちゃま | 冬目漱岩 | 460 | 1 | | 40010 | 吾輩は犬である | 冬目漱岩 | 420 | 1 | +---------+----------------+-------------+-------+------------+ 4 rows in set (0.00 sec) mysql> SELECT * FROM book_table where author_name ='冬目漱岩'AND price= 420; +---------+----------------+-------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+----------------+-------------+-------+------------+ | 40010 | 吾輩は犬である | 冬目漱岩 | 420 | 1 | +---------+----------------+-------------+-------+------------+ 1 row in set (0.00 sec) mysql> DELETE FROM book_table where book_id = 20001; Query OK, 1 row affected (0.00 sec) mysql> SELECT * FROM book_table; +---------+----------------+--------------------+-------+------------+ | book_id | book_name | author_name | price | sales_flag | +---------+----------------+--------------------+-------+------------+ | 10001 | TwoPeace | 三田英一郎 | 420 | 1 | | 10002 | 名探偵金田二 | 青山ふみや | 460 | 1 | | 30001 | 西方見聞録 | マール＝コー＝ポロ | 1000 | 0 | | 40010 | 吾輩は犬である | 冬目漱岩 | 420 | 1 | +---------+----------------+--------------------+-------+------------+ 4 rows in set (0.00 sec)