This is a question onto defining foreign keys in a relational database.
Foreign keys are featured by the InnoDB engine and therefore all three
tables of the database use it:
1. `friends` main table
2. `relation` deploys a simple relation between rows of the main table,
'1-2' means '1 is
1) Sorry for not giving you the version:
Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.
*mysql SELECT VERSION();
+---+
| VERSION() |
+---+
| 5.0.17-nt |
+---+*
1 row in set (0.00 sec)
2) Further, please note that the following output, of
(name) VALUES (School friends);
Query OK, 1 row affected (0.03 sec)
mysql ALTER TABLE friends ADD FOREIGN KEY (category) REFERENCES
category(id);
Query OK, 1 row affected (0.18 sec)
Records: 1 Duplicates: 0 Warnings: 0
*mysql
Sincerely,
Andy Krueger
Michael Stassen wrote:
Andreas Krüger
