1、创建测试表,
create table test_order(id number, value varchar2(50));
2、插入测试数据
insert into test_order values(3,'v3');
insert into test_order values(2,'v2');
insert into test_order values(1,'v1');
insert into test_order values(5,'v5');
insert into test_order values(4,'v4');
commit;
3、查询表中全量数据,可以发现数据并未排序,select t.*, rowid from test_order t;
4、编写sql,数据只要排序后的第一条记录(不用rownum=1) select * from (select t.*, row_number() over(order by id) rn from test_order t) t where rn = 1;