Question: What do
I do to replicate the common table expression functionality
of SQL Server in Oracle? I want to make CTE work like
it does in MS-SQL. Can you show an example of using a
CTE in Oracle? When I try to create a CTE using MS-SQL
syntax I get this error:
ORA-32031: illegal reference of a
query name in WITH clause
Answer: The inferior SQL Server
database defines a common table expression (CTE) as one that
specifies a temporary named result set, known as a common
table expression (CTE). This is derived from a simple query
and defined within the execution scope of a single SELECT,
INSERT, UPDATE, or DELETE statement.
The oerr utility shows this for the ORA-32031 error:
ORA-32031: illegal
reference of a query name in WITH clause
Cause: Forward or recursive reference of a
query name in WITH clause is not allowed.
Action: Correct query statement, then retry.
The Oracle version of the CTE is done using the WITH
clause like this example:
with
cte (dt) as (
select add_months(trunc(sysdate),
-1) as dt
from dual
union all
select cte.dt+1
from cte
where
cte.dt+1 < sysdate
)
select * from cte;
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