PL / SQL中是否存在公用表表达式？

Question

I recently learned about CTE's in SQL Server and am attempting to use it in PL/SQL. I do not need the recurive benefits of it, however, I would like to use it in lieu of creating a view and to improve query performance. Just looking for some direction on what code may be similar.

Answer 1

In Oracle this is known as subquery factoring, and it works the same as in SQL Server AFAIK:

with cte as (select * from emp)
select * from cte join dept on dept.deptno = cte.deptno;

See SELECT documentation and search for "factoring".