so kind of you, sorry for my poor english.
i work it out,  it work

All forthese problem ,i think the reason which MySQL can't work  is that i install the Debian in stable,then i install the Mysql Apache PHP(apt with the stable source)
,but  someday i change the apt source to unstable.So these problem  may happen.

Now i get that MySQL include the mysql-server ,mysql-common,mysql-client. Is it right? so when i reinstall the MySQL,apt or dpkg is confused that mysql
is already install, and i am confused too.
Finally ,where is the path to MySQL, /var/lib/mysql(path to Database), /usr/share/doc/mysql/ (DOC), /etc/mysql (the conf files), is there more ?

thx again
--
其实阿峰不坏

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