11.07 存取“未来”行

标签：select   ext   条件   员工   from   next   sel   red   date   

找到满足这样条件的员工：即他的收入比紧随其后聘用的员工要少。

select ename,sal,hiredate
from (
select a.ename,a.sal,a.hiredate,
(select min(hiredate) from emp b
where b.hiredate>a.hiredate
and b.sal>a.sal) as next_sal_grtr,
(select min(hiredate) from emp b
where b.hiredate>a.hiredate) as next_hire
from emp a
)x 
where next_sal_grtr=next_hire;

11.07 存取“未来”行

标签：select   ext   条件   员工   from   next   sel   red   date   

原文地址：http://www.cnblogs.com/liang545621/p/7523393.html