产生3年

Question

捆绑生成3年的数据如下

31-DEC-17
31-DEC-18
31-DEC-19

以下查询生成3个月。我如何将此转移到3年

select LAST_DAY(add_months(date '2017-01-01', level - 1)) as mth 
        from dual 
        connect by level <= 3

Answer 1

将参数乘以12：

select last_day(add_months(date '2017-01-01', (level - 1) * 12 )) as mth 
  from dual 
  connect by level <= 3

demo

Answer 2

使用<= 36，这将产生到31-DEC-19

    select LAST_DAY(add_months(date '2017-01-01', level - 1)) as mth 
        from dual 
        connect by level <= 36

Answer 3

正如@APC提到的，last_day函数取决于您的NLS日期设置。因此，您可能更喜欢将truncate函数截断为yyyy指定的单位，如下所示：

select add_months(trunc(date'2017-01-01','yyyy'), level * 12 ) - 1
       as "Last Days"
  from dual 
connect by level <= 3;

Last Days
----------
2017-12-31
2018-12-31
2019-12-31

Demo