RT Dec 1 1986 12:00:00:000AM 的格式是客户那导过来的。在数据库里是字符串 怎么才能转换成1986-12-1这样的格式呀！
------解决方案--------------------------------------------------------
SELECT TO_DATE (SUBSTR ('RT Dec 1 1986 12:00:00:000AM', 6),
'Mon dd yyyy hh:mi:ss:SSSSSAM',
'NLS_DATE_LANGUAGE = American'
)
FROM TEST