mysql导出数据的方法

mysql -hxxx -uroot -pxxx xxxx --skip-column-names -e "select (CASE  WHEN xx<60 THEN 1 WHEN (xx>=60 and xx<90) THEN 2  ELSE 4 END) t from xxx where xxx>=unix_timestamp('2012-10-10')" > /tmp/xxx.txt  | sort -n | uniq -c;