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Getting a Nested With Clause error while creating a Table

Chandu VenuSep 16 2021

Hello,
I am trying to create a table from a query. However I am getting the following error:
ORA-32034: unsupported use of WITH clause
32034. 00000 - "unsupported use of WITH clause"
*Cause: Inproper use of WITH clause because one of the following two reasons
1. nesting of WITH clause within WITH clause not supported yet
2. For a set query, WITH clause can't be specified for a branch.
3. WITH clause cannot be specified within parenthesis.
My current Query Structure that's throwing the above error:
With Q2 AS (
SELECT Q1.col1, Q1.col2,Q1.col3
FROM
(Select col1,col2,col3 from table) Q1
),
Q3 AS (
Select Q2.col1,Q2.col2,Q3.col3
FROM Q2
WHERE <conditions>
),
Q4 AS (
Select Q3.col1,Q3.col2,Q3.col3,Q2.col1,Q2.col2,Q3.col3
from Q3 left outer join Q2 on col1 = col1
),
select * from Q4;

Please let me know how I can change my query structure to avoid this error.

Thank you.

This post has been answered by mathguy on Sep 16 2021
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Added on Sep 16 2021
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