求一个sql语句，可以从oracle的dual表中得到近五年的年份值，即查询结果为
2008
2009
2010
2011
2012
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- SQL code
SELECT to_char(SYSDATE,'YYYY') - LEVEL + 1 years FROM dual connect by LEVEL <= 5 ORDER BY 1
------解决方案--------------------
LS的是转换先成年了 再计算 也可以先计算再转成年
- SQL code
select to_char(add_months(sysdate,-12*(level-1)),'yyyy') yyfrom dualconnect by level<=5
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select to_char(sysdate,'yyyy') from dual
union
select to_char(sysdate-365,'yyyy') from dual
union
select to_char(sysdate-365*2,'yyyy') from dual
union
select to_char(sysdate-365*3,'yyyy') from dual
union
select to_char(sysdate-365*4,'yyyy') from dual
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