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mysql  Ver 14.12 Distrib 5.0.45, for redhat-linux-gnu (i686) using readline 5.0

我有一个像这样定义的表:

+-----------------------+--------------+------+-----+---------+-------+
| Field                 | Type         | Null | Key | Default | Extra |
+-----------------------+--------------+------+-----+---------+-------+
| id                    | bigint(20)   | NO   | PRI |         |       | 
| user_id               | bigint(20)   | NO   | MUL |         |       | 
| directory_id          | bigint(20)   | NO   | MUL |         |       | 
| attribute_name        | varchar(255) | NO   |     |         |       | 
| attribute_value       | varchar(255) | YES  |     | NULL …