替换
all spaces：
UPDATE `table` SET `col_name` = REPLACE(`col_name`, ' ', '')
删除所有
tabs字符：
UPDATE `table` SET `col_name` = REPLACE(`col_name`, 't', '' )
删除所有
new line字符：
UPDATE `table` SET `col_name` = REPLACE(`col_name`, 'n', '')
http://dev.mysql.com/doc/refman/5.0/zh-CN/string-
functions.html#function_replace
删除
first and last space(s)列：
UPDATE `table` SET `col_name` = TRIm(`col_name`)
http://dev.mysql.com/doc/refman/5.0/zh-CN/string-
functions.html#function_trim
