摘要：
select e.job as 工作, sum(case e.deptno when 10 then sal end) as 部门10的工资, sum(case e.deptno when 20 then sal end) as 部门20的工资, sum(case e.deptno when 30 阅读全文
摘要：
select mod(rr,2), v.* from (select rownum as rr,t.* from (select * from emp where sal is not null order by sal)t where rownum <=10 )v where rr>2 and m 阅读全文
摘要：
select * from (select rownum as rr,t.* from (select * from emp where sal is not null order by sal)t where rownum <=10 )where rr>2; 阅读全文
摘要：
ribbon是服务之间的负载 zuul是客户端的负载 阅读全文