I need to write a query as below - query given is just for concept.
I am getting ORA-00942: table or view does not exist
for view table inner_nested_table
used in with
clause.
First, is it legal to use it like this? If no, is there any work-around I can use.
select
inner_nested_table.column1,
inner_nested_table.column2,
inner_nested_table.column3,
(
with test as (
select
column4, column5
from
inner_nested_table
)
select column4 from test
) columnX
from
(
select
column1,
column2,
column3,
column4,
column5
from
actual_table
) inner_nested_table;
The test
sub-query is nested too deeply for the SQL engine to find the inner_nested_table
. Oracle supports finding aliases nested one level apart but not two.
Instead, you can use:
WITH inner_nested_table AS (
select column1,
column2,
column3,
column4,
column5
from actual_table
),
test AS (
select column4
from inner_nested_table
)
select column1,
column2,
column3,
(select column4 from test) AS columnX
from inner_nested_table;
db<>fiddle here