表格test数据
select * from test order by name desc
结果：
1-1：select * from ( select A.*,rownum rn from test A order by name asc ) where rn between 0 and 10
结果：
1-2：select * from ( select A.*,rownum rn from test A order by name desc ) where rn between 0 and 10
结果：
2-1：select A.*,rownum from test A where rownum between 0 and 10 order by name desc
结果：
2-2：select A.*,rownum from test A where rownum between 0 and 10 order by name asc
结果：
3-1：select * from ( select A.*,Row_Number() OVER (order by name desc) as rn from test A ) where rn between 0 and 10
结果：
3-2：select * from ( select A.*,Row_Number() OVER (order by name asc) as rn from test A ) where rn between 0 and 10
结果：
结论：第三种查询语句是先排序后取数据，而前面两种是先取数据后查询，对于不是主键的字段。