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Question1です

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小川　悠里
2026-09-28 12:59:06 +09:00
parent a2236aae21
commit d00e04b593
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【練習問題】 SQL/Question1/Quetion1.sql Normal file
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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)