--相當於建了個e臨時表
with e as (select * from scott.emp e where e.empno=7499)
select * from e;
 
--相當於建了e、d臨時表
with
     e as (select * from scott.emp),
     d as (select * from scott.dept)
select * from e, d where e.deptno = d.deptno;
 

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