Oracle取查询结果数据的第一条记录SQL：
select * from (select * from <table> order by <key>) where rownum=1; select * from (select * from <table> order by <key> desc) where rownum=1;
Oracle取查询结果数据的第一条记录SQL
原文：http://www.cnblogs.com/xusweeter/p/5837423.html
