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Parsing order (Was: "select ... connect by..." in the view)

Igor Neyman

2004-03-10

Replies:

Ok, I see no takers on my original question (how to create a view based on “select … connect by… and prior… start with…” to get the hierarchy).

May be this will spark some interest, I guess it’s about parsing order.

 

The view I’m using looks like this:

 

SQL*Plus: Release 9.2.0.1.0 - Production on Wed Mar 10 08:42:51 2004

 

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

 

Connected to:

Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production

With the Partitioning, OLAP and Oracle Data Mining options

JServer Release 9.2.0.1.0 - Production

 

SQL> create or replace view test_view_ms as

  2  SELECT

  3  vt.model_id, vt.lvl "LEVEL", vt.parent_subassembly_id, vt.subassembly_id

  4  FROM test_ms tm, TABLE(m_tree(tm.model_id)) vt;

 

View created.

 

And it works fine; “m_tree” is a function that hides “select … connect by… and prior… start with…”.

“test_ms” table added to the join in order to be able to specify “model_id” when querying this view.

 

But, if I change the order in the “FROM” list, I get an error:

 

SQL> create or replace view test_view_ms as

  2  SELECT

  3  vt.model_id, vt.lvl "LEVEL", vt.parent_subassembly_id, vt.subassembly_id

  4  FROM TABLE(m_tree(tm.model_id)) vt, test_ms tm;

FROM TABLE(m_tree(tm.model_id)) vt, test_ms tm

                  *

ERROR at line 4:

ORA-00904: "TM"."MODEL_ID": invalid identifier

 

Is it because of the way (order) Oracle is parsing this view?

 

Igor Neyman, OCP DBA

ineyman@perceptron.com

 

 

-----Original Message-----
From: oracle-l-bounce@freelists.org [mailto:oracle-l-bounce@freelists.org] On Behalf Of Igor Neyman
Sent:
Thursday, February 26, 2004 11:44 AM
To: oracle-l@freelists.org
Subject: "select ... connect by..." in the view

 

Just wonder if anyone has (or came across) better solution for this.

 

I had a request from developer to put “select … connect by…” into view.

He wants to get the hierarchy in one step, but the “framework” he is using doesn’t allow him to issue “select … connect by…”.

I’ve got rather ugly solution for him (which I can share if anyone interested, didn’t want this message to be long), using user types, function, and the final view looks like this:

 

create or replace view test_view_ms as

SELECT

vt.model_id, vt.lvl "LEVEL", vt.parent_subassembly_id, vt.subassembly_id

FROM test_ms tm, TABLE(m_tree(tm.model_id)) vt;

 

So, now he can get the hierarchy for specified model with just:

select from test_view_ms where model_id = …

 

Igor Neyman, OCP DBA

ineyman@perceptron.com