为MySQL添加帮助信息
在MySQL的网站上下载它提供的帮助文件，http://dev.mysql.com/doc/，MySQL Help Tables。然后直接导入到MySQL的系统数据库中
mysql mysql < file_name
之后用MySQL自带client（就是mysql命令）连接就可以使用帮助，比如 mysql> help create index
Name: 'CREATE INDEX'
Description:
Syntax:
CREATE INDEX index_name
ON tbl_name (index_col_name,...)
index_col_name:
col_name [(length)]
index_type:
USING {BTREE | HASH}
CREATE INDEX is mapped to an ALTER TABLE statement to create indexes.
See . For more information about indexes, see
http://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html.
URL: http://dev.mysql.com/doc/refman/5.0/en/create-index.html
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