Hi;

mysql> insert into categories (Category, Parent) values ('test', NULL);
ERROR 1062 (23000): Duplicate entry '0' for key 1
mysql> describe categories;
+----------+-----------------+------+-----+---------+-------+
| Field    | Type            | Null | Key | Default | Extra |
+----------+-----------------+------+-----+---------+-------+
| ID       | int(3) unsigned | NO   | PRI | NULL    |       |
| Category | varchar(40)     | YES  |     | NULL    |       |
| Parent   | varchar(40)     | YES  |     | NULL    |       |
+----------+-----------------+------+-----+---------+-------+
3 rows in set (0.00 sec)

Why the error?
TIA,
Victor

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