Finding Rows with No Match in Another Table
mysql>
mysql> CREATE TABLE author
-> (
-> a_id INT UNSIGNED NOT NULL AUTO_INCREMENT, # author ID
-> name VARCHAR(30) NOT NULL, # author name
-> PRIMARY KEY (a_id),
-> UNIQUE (name)
-> );
Query OK, 0 rows affected (0.01 sec)
mysql> CREATE TABLE book
-> (
-> a_id INT UNSIGNED NOT NULL, # author ID
-> p_id INT UNSIGNED NOT NULL AUTO_INCREMENT, # book ID
-> title VARCHAR(100) NOT NULL, # title of book
-> state VARCHAR(2) NOT NULL, # state where purchased
-> price INT UNSIGNED, # purchase price (dollars)
-> INDEX (a_id),
-> PRIMARY KEY (p_id)
-> );
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> INSERT INTO author (name) VALUES
-> ('Tom'),
-> ('Monet'),
-> ('Jack'),
-> ('Picasso'),
-> ('Mary')
-> ;
Query OK, 5 rows affected (0.00 sec)
Records: 5 Duplicates: 0 Warnings: 0
mysql>
mysql>
mysql>
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'Database', 'IN', 34 FROM author WHERE name = 'Tom';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql>
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'SQL', 'MI', 87 FROM author WHERE name = 'Tom';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql>
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'MySQL', 'KY', 48 FROM author WHERE name = 'Jack';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'XML', 'KY', 67 FROM author WHERE name = 'Jack';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'Java', 'IA', 33 FROM author WHERE name = 'Jack';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql>
mysql> INSERT INTO book (a_id,title,state,price)
-> SELECT a_id, 'HTML', 'NE', 64 FROM author WHERE name = 'Mary';
Query OK, 1 row affected (0.00 sec)
Records: 1 Duplicates: 0 Warnings: 0
mysql>
mysql>
mysql>
mysql> SELECT * FROM author ORDER BY a_id;
+------+---------+
| a_id | name |
+------+---------+
| 1 | Tom |
| 2 | Monet |
| 3 | Jack |
| 4 | Picasso |
| 5 | Mary |
+------+---------+
5 rows in set (0.00 sec)
mysql> SELECT * FROM book ORDER BY a_id, p_id;
+------+------+----------+-------+-------+
| a_id | p_id | title | state | price |
+------+------+----------+-------+-------+
| 1 | 1 | Database | IN | 34 |
| 1 | 2 | SQL | MI | 87 |
| 3 | 3 | MySQL | KY | 48 |
| 3 | 4 | XML | KY | 67 |
| 3 | 5 | Java | IA | 33 |
| 5 | 6 | HTML | NE | 64 |
+------+------+----------+-------+-------+
6 rows in set (0.00 sec)
mysql>
mysql> SELECT * FROM author, book WHERE author.a_id != book.a_id;
+------+---------+------+------+----------+-------+-------+
| a_id | name | a_id | p_id | title | state | price |
+------+---------+------+------+----------+-------+-------+
| 2 | Monet | 1 | 1 | Database | IN | 34 |
| 3 | Jack | 1 | 1 | Database | IN | 34 |
| 4 | Picasso | 1 | 1 | Database | IN | 34 |
| 5 | Mary | 1 | 1 | Database | IN | 34 |
| 2 | Monet | 1 | 2 | SQL | MI | 87 |
| 3 | Jack | 1 | 2 | SQL | MI | 87 |
| 4 | Picasso | 1 | 2 | SQL | MI | 87 |
| 5 | Mary | 1 | 2 | SQL | MI | 87 |
| 1 | Tom | 3 | 3 | MySQL | KY | 48 |
| 2 | Monet | 3 | 3 | MySQL | KY | 48 |
| 4 | Picasso | 3 | 3 | MySQL | KY | 48 |
| 5 | Mary | 3 | 3 | MySQL | KY | 48 |
| 1 | Tom | 3 | 4 | XML | KY | 67 |
| 2 | Monet | 3 | 4 | XML | KY | 67 |
| 4 | Picasso | 3 | 4 | XML | KY | 67 |
| 5 | Mary | 3 | 4 | XML | KY | 67 |
| 1 | Tom | 3 | 5 | Java | IA | 33 |
| 2 | Monet | 3 | 5 | Java | IA | 33 |
| 4 | Picasso | 3 | 5 | Java | IA | 33 |
| 5 | Mary | 3 | 5 | Java | IA | 33 |
| 1 | Tom | 5 | 6 | HTML | NE | 64 |
| 2 | Monet | 5 | 6 | HTML | NE | 64 |
| 3 | Jack | 5 | 6 | HTML | NE | 64 |
| 4 | Picasso | 5 | 6 | HTML | NE | 64 |
+------+---------+------+------+----------+-------+-------+
24 rows in set (0.00 sec)
mysql>
mysql> drop table book;
Query OK, 0 rows affected (0.00 sec)
mysql> drop table author;
Query OK, 0 rows affected (0.00 sec)