Oracle使用to_date

Question

SELECT   TO_DATE (2014 || '.09.30', 'yyyy.mm.dd')
       - TO_DATE (2104 || '.07.01', 'yyyy.mm.dd')
          AS "Wtf",
       TO_DATE (2014 || '.09.30', 'yyyy.mm.dd') AS date_to,
       TO_DATE (2104 || '.07.01', 'yyyy.mm.dd') AS date_from
  FROM DUAL

返回-32781 2014/09/09/2104/07/01 /

为什么我得到-32781？我期待-90 ...

谢谢..

Answer 1

难道今年是2104而不是2014年？