Hi! On Jan 16, Stefan Hinz wrote: > Keith, > > thanks once again! Well, anyone here from the MySQL developer team? Or > any other guru who can explain why 10 = 11? > > Here's the problem once again: > > mysql> DESCRIBE myrowisam; > +-------+----------+------+-----+---------+-------+ > | Field | Type | Null | Key | Default | Extra | > +-------+----------+------+-----+---------+-------+ > | col | char(10) | YES | MUL | NULL | | > +-------+----------+------+-----+---------+-------+ > mysql> SHOW TABLE STATUS LIKE 'myrowisam'; > +-----------+--------+------------+------+----------------+ > | Name | Type | Row_format | Rows | Avg_row_length | > +-----------+--------+------------+------+----------------+ > | myrowisam | MyISAM | Fixed | 109 | 11 | > +-----------+--------+------------+------+----------------+ > > Regards, > -- > Stefan Hinz <[EMAIL PROTECTED]> > Gesch?ftsf?hrer / CEO iConnect GmbH <http://iConnect.de> > Heesestr. 6, 12169 Berlin (Germany) > Tel: +49 30 7970948-0 Fax: +49 30 7970948-3
It's because of NULLs. Extra byte is used to mark, if the column is NULL or not. (in fact it's a bitmap, that is it would be one byte for up to 8 columns, then it'll be 2 bytes, etc.) Regards, Sergei -- MySQL Development Team __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Sergei Golubchik <[EMAIL PROTECTED]> / /|_/ / // /\ \/ /_/ / /__ MySQL AB, http://www.mysql.com/ /_/ /_/\_, /___/\___\_\___/ Osnabrueck, Germany <___/ --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
