INSERT-SELECT not working with FETCH NEXT [x] ROWS [closed] - sql

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I have query
INSERT INTO MYTABLE(NAME,NUM)
SELECT NAME,NUM
FROM DATA
INNER JOIN T3
ON MYTABLE.NUM = T3.NUM
ORDER BY MYTABLE.NUM
OFFSET 0 ROWS
FETCH NEXT 5 ROWS ONLY;
Running this results in following error:
SQL Error: ORA-00918: column ambiguously defined
But when I run above query without the OFFSET part it works.
Is FETCH incompatible with INSERT SELECT?

Answer 1

Yes, FETCH is compatible with INSERT...SELECT. I'm posting this as answer rather than a comment, because it is the answer to the question you posted.
The most common cause of ORA-00918 with the FETCH clause is the caveat that none of the variables in the select list may have the same name. E.g., this SELECT is legal:
SELECT object_type, object_name, object_name
FROM dba_objects
WHERE OBJECT_NAME LIKE 'USER%'
ORDER BY 1, 2
.. and this one is not ...
SELECT object_type, object_name, object_name
FROM dba_objects
WHERE OBJECT_NAME LIKE 'USER%'
ORDER BY 1, 2
OFFSET 0 ROWS
FETCH NEXT 5 ROWS ONLY;
Check your query and make sure all the column names / aliases are unique.
UPDATE
Reviewing your SQL Fiddle, this is a garden variety ORA-00918. It has nothing to do with either your INSERT or your FETCH. You are joining two tables that have the same columns in them and you are not specifying which you want to select and order by. Change your statement to this:
insert into t2(id, val)
select t.id, t.val
from t
inner join t3
on t.val=t3.val
order by t.id desc
offset 3 rows
fetch first 5 rows only