Question

我们正在重写最初包含6个CREATE / REPLACE VIEW的SQL脚本，因为我们的新应用程序无法在数据库中创建对象。要重写它，我们使用WITH关键字。

问题是，原始视图互相引用。在Oracle中是否允许这样做：

with 
  A as (select T1COL from Table1 ...), 
  B as (select NEWCOL from A ...) ,
..

Answer 1

答案是：是的，这是可能的。

由于涉及大量代码，快速尝试它是不可行的。人们希望快速反应不会太困难

我为你准备了一个可运行的测试： http://sqlfiddle.com/#!4/9eecb7d/7884

WITH 
  a AS ( SELECT 'A' as T1COL FROM dual ),
  b AS ( SELECT * FROM a ),
  c AS ( SELECT * FROM b ),
  d AS ( SELECT * FROM c ),
  e AS ( SELECT * FROM d ),
  f AS ( SELECT * FROM e ),
  g AS ( SELECT * FROM f ),
  h AS ( SELECT * FROM g ),
  i AS ( SELECT * FROM h ),
  j AS ( SELECT * FROM i ),
  k AS ( SELECT * FROM j ),
  l AS ( SELECT * FROM k ),
  m AS ( SELECT * FROM l ),
  n AS ( SELECT * FROM m ),
  o AS ( SELECT * FROM n ),
  p AS ( SELECT * FROM o ),
  q AS ( SELECT * FROM p )  
SELECT * FROM q;

（Oracle）多个WITH子句相互引用

1 个答案: