Oralce生成前N年的年数据

今天做一个统计报表的时候正好碰到这个问题，原来，一般是通过后台代码来生成。现在直接通过oracle来生成，记录一下。

方法一：

SELECT YEAR FROM 
(
  SELECT TO_CHAR(SYSDATE-ROWNUM*365,‘YYYY‘) YEAR FROM DUAL CONNECT BY ROWNUM<65
  UNION
  SELECT TO_CHAR(SYSDATE,‘YYYY‘) YEAR FROM DUAL
)ORDER BY   YEAR DESC;

方法二：
SELECT YEAR FROM 
(
  SELECT TO_CHAR(SYSDATE-ROWNUM*365,‘YYYY‘) YEAR FROM DUAL CONNECT BY LEVEL<10
  UNION
  SELECT TO_CHAR(SYSDATE,‘YYYY‘) YEAR FROM DUAL
)ORDER BY   YEAR DESC;