Mega Code Archive
Using XOR to link two conditions
<![CDATA[
mysql>
mysql> CREATE TABLE Books(
-> BookID SMALLINT NOT NULL PRIMARY KEY,
-> BookName VARCHAR(40) NOT NULL,
-> Category VARCHAR(15),
-> InStock SMALLINT NOT NULL,
-> OnOrder SMALLINT NOT NULL
-> );
Query OK, 0 rows affected (0.03 sec)
mysql>
mysql> INSERT INTO Books VALUES (101, 'Java', 'Nonfiction', 12, 13),
-> (102, 'MySQL', 'Fiction', 17, 20),
-> (103, 'Oracle', 'Nonfiction', 23, 33),
-> (104, 'VB.net', 'Nonfiction', 32, 12),
-> (105, 'www.rntsoft.com', 'Fiction', 6, 35),
-> (106, 'Perl', 'Fiction', 28, 14),
-> (107, 'Php', NULL, 46, 3);
Query OK, 7 rows affected (0.01 sec)
Records: 7 Duplicates: 0 Warnings: 0
mysql>
mysql> select * from Books;
+--------+----------------+------------+---------+---------+
| BookID | BookName | Category | InStock | OnOrder |
+--------+----------------+------------+---------+---------+
| 101 | Java | Nonfiction | 12 | 13 |
| 102 | MySQL | Fiction | 17 | 20 |
| 103 | Oracle | Nonfiction | 23 | 33 |
| 104 | VB.net | Nonfiction | 32 | 12 |
| 105 | www.rntsoft.com | Fiction | 6 | 35 |
| 106 | Perl | Fiction | 28 | 14 |
| 107 | Php | NULL | 46 | 3 |
+--------+----------------+------------+---------+---------+
7 rows in set (0.00 sec)
mysql>
mysql> SELECT BookName, Category, InStock, OnOrder
-> FROM Books
-> WHERE Category='Fiction' XOR InStock IS NULL
-> ORDER BY BookName;
+----------------+----------+---------+---------+
| BookName | Category | InStock | OnOrder |
+----------------+----------+---------+---------+
| MySQL | Fiction | 17 | 20 |
| Perl | Fiction | 28 | 14 |
| www.rntsoft.com | Fiction | 6 | 35 |
+----------------+----------+---------+---------+
3 rows in set (0.00 sec)
mysql> drop table Books;
Query OK, 0 rows affected (0.00 sec)
mysql>
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