Oracle WITH 语句 语法

With语句可以在查询中做成一个临时表/View，用意是在接下来的SQL中重用，而不需再写一遍。

With Clause方法的优点： 增加了SQL的易读性，如果构造了多个子查询，结构会更清晰。

示例：

with soloemp as (select distinct salary from hy_emp)
select avg(salary) from
(select dense_rank() over (order by salary) as seq, dense_rank() over (order by salary desc) as revseq,salary from soloemp) a
where abs(a.seq-a.revseq)<=1

参考网页：https://www.cnblogs.com/mingforyou/p/8295239.html

--2020-04-14--