from ddd
where substr(to_char(ddd.cxsj,'yyyy-MM-dd HH24:mi:ss'),12,2)>'12'
and substr(to_char(ddd.cxsj,'yyyy-MM-dd HH24:mi:ss'),12,2)<'17'
from ddd
where substr(to_char(ddd.cxsj,'yyyy-MM-dd HH24:mi:ss'),12,2)>'12'
and substr(to_char(ddd.cxsj,'yyyy-MM-dd HH24:mi:ss'),12,2)<'17'