MySQL, PHP or ghost?

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Seems that either I don't understand mysql, or something.

My table, with the non-important things removed...

    mysql> explain plate;
    +---------+-----------------------+------+-----+---------------------+----------------+
    | Field   | Type                  | Null | Key | Default             | Extra          |
    +---------+-----------------------+------+-----+---------------------+----------------+
    | pid     | mediumint(8) unsigned |      | PRI | NULL                | auto_increment |
    | year    | year(4)               | YES  |     | NULL                |                |
    [...]

So my assumption is that if I insert with year="" it should use the
default.  Or at least 0000.

    mysql> update plate set year=NULL where pid=65;
    Query OK, 1 row affected (0.00 sec)
    Rows matched: 1  Changed: 1  Warnings: 0

    mysql> select * from plate where pid=65;
    +-----+---------+------+-
    | pid | plate   | year |
    +-----+---------+------+-
    |  65 | DVF0343 | NULL |
    +-----+---------+------+-

But if I do this:

    mysql> update plate set year="" where pid=65;
    Query OK, 1 row affected (0.01 sec)
    Rows matched: 1  Changed: 1  Warnings: 1

    mysql> select * from plate where pid=65;
    +-----+---------+------+-
    | pid | plate   | year |
    +-----+---------+------+-
    |  65 | DVF0343 | 2000 |
    +-----+---------+------+-

2000?  What?  Why?  Confused.  PHP or Mysql fault?

Beckman
---------------------------------------------------------------------------
Peter Beckman                                                  Internet Guy
beckman@purplecow.com                             http://www.purplecow.com/
---------------------------------------------------------------------------

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