> It may be worth mentioning that, IIRC, CHAR is faster due to the fixed
> length. If you can make your table use a fixed length row size (ie no
> variable length columns), it'll be faster.

I'd be interested in seeing tests about this.. I doubt there's any difference.

> Also I could be missing
> something, but I can't see the advantage in VARCHAR since space is not
> really a concern these days.

char is fixed length and padded. If you don't fill up the space, the
db does it for you (even though it seems it's internal only).

http://dev.mysql.com/doc/refman/5.0/en/char.html

When CHAR values are stored, they are right-padded with spaces to the
specified length. When CHAR values are retrieved, trailing spaces are
removed.

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