解决bash: mysql: command not found

cd /usr/local/bin

ln -fs /www/server/mysql/bin/mysqldumpslow mysqldumpslow

统计
select count(type='1' or null) as '分类1’，count(type='3' or null as '分类2’ from user

子查询

连接查询去重 distinct
from_unixtime

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http://blog.itpub.net/807718/viewspace-2158116/