使用Oracle 9i将单个文本列列表转换为2列列表

Question

我有一份国家清单

SELECT * FROM COUNTRIES

COUNTRY
--------------
Austria
Belarus
Belgium
Finland
France
Iceland
Ireland
Switzerland

我如何选择2列,例如

COLUMN1          COLUMN2
-------          -------
Austria          Belarus
Belgium          Finland
France           Iceland
Ireland          Switzerland

谢谢.

Answer 1

select country, next_country
from 
  (select country, 
         lead(country) over (order by country) next_country,
         row_number() over (order by country) rnk
   from countries
  ) 
where mod(rnk,2)=1;