| Field | Description | Type | Null | Key | Default | Extra |
| ----- | ----------- | ---- | ---- | --- | ------- | ----- |
-| id | | int unsigned | YES | PRI | NULL | auto_increment |
-| uri | URI of an item | varbinary(255) | YES | | NULL | |
-| guid | A unique identifier for an item | varbinary(255) | NO | | NULL | |
+| id | | int unsigned | NO | PRI | NULL | auto_increment |
+| uri | URI of an item | varbinary(255) | NO | | NULL | |
+| guid | A unique identifier for an item | varbinary(255) | YES | | NULL | |
Return to [database documentation](help/database)