Oracle查询出来的数据只取第一条和最后一条

版权声明： https://blog.csdn.net/Dongguabai/article/details/84339100

结合oracer by和rownum来做：

--第一条
select * from bdatag_tag order by tag_id where rownum = 1;
--最后一条
select * from bdatag_tag order by tag_id desc where rownum = 1;