Join the problem

I am currently running Oracle version 11.1.0.7.0. I found a piece of view which I think does not behave as I expect. For me, this looks like a bug in Oracle, but I hope you can show me that this is not a bug and I hurt something else. I was able to reproduce this problem with these table definitions:

create the table kaw_base
(base_id number of non-null
key constraint pk_kaw_base primary.
subtype_code varchar2 (1)
);

create the table kaw_subtype1
(base_id number of non-null
key constraint pk_kaw_subtype1 primary.
Order_Id varchar2 (16).
constraint fk_subtype1__base
foreign key (base_id) references kaw_base
);

create the table kaw_subtype2
(base_id number of non-null
key constraint pk_kaw_subtype2 primary.
Order_Id varchar2 (16).
constraint fk_subtype2__base
foreign key (base_id) references kaw_base
);

create the table kaw_ref
(ref_id number not null
key constraint pk_kaw_ref primary.
number of base_id not null
constraint fk_ref__base
Reference kaw_base
);

create indexes kaw_ref_ndx02
on kaw_ref (base_id);

I filled the tables with these data:

insert into kaw_base
Select 1, null of union double all the
Select 2, '1' of any double Union
Select 3, '1' of any double Union
Select option 4, '2' from dual;
Select * from kaw_base;

insert into kaw_subtype1
Select 2, '101' of any double union
Select 3, '102' from dual;
Select * from kaw_subtype1;

insert into kaw_subtype2
Select 4, '103' double;
Select * from kaw_subtype2;

insert into kaw_ref
Select 500 + base_id, kaw_base base_id;
Select * from kaw_ref;

I then ran this series of requests to try to give the idea of what I see to this problem:

-- --------------------------------------------------------
-This first query shows the ID of lines which
-must be returned by this query. Get all four rows
-back and all is good in th world.
--
- But just try to add j.order_ID to the results!
-- --------------------------------------------------------
Select
XREF.base_id
-, j.order_Id
of kaw_ref xRef
Join
-left join
(select
a.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
-join kaw_subtype1 c on the left
On c.base_id = a.base_id
) j
On j.base_id = xref.base_id
-where j.base_id is not null
;

/ * Sample output:
BASE_ID
----------
1
2
3
4

4 selected lines.
*/

-- --------------------------------------------------------
-What happened? I don't think that adding a column to
-the selection list should cause the lines to completely
-disappear.
--
-I walk what happens if I change the second LEFT JOIN
- is the same as the first join?
-- --------------------------------------------------------
Select
XREF.base_id
j.order_Id
of kaw_ref xRef
Join
-left join
(select
a.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
-join kaw_subtype1 c on the left
On c.base_id = a.base_id
) j
On j.base_id = xref.base_id
-where j.base_id is not null
;

/ * Sample output:

no selected line.
*/

-- --------------------------------------------------------
-Still more curious. It seems to me that this could be
-treatment he two LEFT joins as INNER joins and only
-returning data with KAW_BASE and KAW_SUBTYPE1 in
-common.
--
-We will try to change the rear query in a way that both
-Joined LEFT pointing the two subtype tables and let's
-also add, in the superfluous, WHERE clause and see what
-makes for (for us).
-- --------------------------------------------------------
Select
XREF.base_id
j.order_Id
of kaw_ref xRef
Join
-left join
(select
a.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
-join kaw_subtype2 c on the left
c left join kaw_subtype1
On c.base_id = a.base_id
) j
On j.base_id = xref.base_id
-where j.base_id is not null
;

/ * Sample output:

BASE_ID ORDER_ID
---------- ----------------
2 101
3 102

2 selected lines.
*/

-- --------------------------------------------------------
-OK, the superfluous where clause seems to provide a means
-to work around this problem
--
-Will be LEFT JOIN more the WHERE clause also works
- as a workaround?
-- --------------------------------------------------------
Select
XREF.base_id
j.order_Id
of kaw_ref xRef
Join
-left join
(select
a.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
-join kaw_subtype1 c on the left
On c.base_id = a.base_id
) j
On j.base_id = xref.base_id
-- --------------------------------------------------------
-Just comment on the WHERE clause:
--
-OK, this when the clause seems quite unnecessary.
-However, for some unknown reason this where clause
-must be included so that the select clause can
-Returns the correct results
--
-Can anyone please tell me why when the clause is
-necessary?
-- --------------------------------------------------------
where j.base_id is not null
;

/ * Sample output:

BASE_ID ORDER_ID
---------- ----------------
1
2 101
3 102
4 103

4 selected lines.
*/

-- --------------------------------------------------------
-The LEFT JOIN can also be used to circumvent this
-publish; However, I prefer to avoid the kind of "from".
de - facto' inner joins because they lead to questions
-associated with what the original author intended.
-in particular, the original author didn't intend to return
-the data with an inner join or did the author really
-intend to include the other ranks too, but make one
-unusual coding error?
--
-Will use nested rather than using join syntax of
-a table derived also solve this problem?
-- --------------------------------------------------------
Select
XREF.base_id
j.order_Id
of kaw_ref xRef
-join
left join
(select
a.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
-join kaw_subtype1 c on the left
On c.base_id = a.base_id
) j
On j.base_id = xref.base_id
-- --------------------------------------------------------
-This where clause should be included to convert the
-an outer join in an inner join "de facto".
-- --------------------------------------------------------
where j.base_id is not null
;

/ * Sample output:

BASE_ID ORDER_ID
---------- ----------------
1
2 101
3 102
4 103

4 selected lines.
*/

-- --------------------------------------------------------
-Unfortunately, move to the nested join syntax
-do not in itself solves this problem.
--
-Added in the redundant WHERE clause will provide
-a work around?
-- --------------------------------------------------------
Select
XREF.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_ref xRef
Join
(kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
On c.base_id = a.base_id
) on a.base_id = xref.base_id
-- --------------------------------------------------------
-This where clause should be included to convert the
-an outer join in an inner join "de facto".
-- --------------------------------------------------------
-where j.base_id is not null
;

/ * Sample output:

no selected line.
*/

-- --------------------------------------------------------
-Adding the redundant search where clause provides
-something that causes this query works correctly.
--
-Is this a bug?
-- --------------------------------------------------------
Select
XREF.base_id,
COALESCE(b.order_Id, c.Order_Id) as Order_Id
of kaw_ref xRef
Join
(kaw_base one
Join kaw_subtype1 b left
On b.base_id = a.base_id
c left join kaw_subtype2
On c.base_id = a.base_id
) on a.base_id = xref.base_id
-- --------------------------------------------------------
-This where clause must be included as a work around to
-to ensure that the correct rows will be returned
-- --------------------------------------------------------
where a.base_id is not null
;

/ * Sample output:

BASE_ID ORDER_ID
---------- ----------------
1
2 101
3 102
4 103

4 selected lines.
*/

Can someone tell me what exactly is going on with this?

Hello

Would be - this bug #9011590 "bad results due to the elimination of the join?
He described as possibly a regression introduced with 11.1.0.7 patch set.

Oracle Support says 11.2 is affected too, but I can't reproduce with your test case.

Just in case, you could try one of the following workarounds?

alter session set "_optimizer_join_elimination_enabled" = false;

alter session set "_fix_control" = '6167716:OFF';

Tags: Database

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  • px12-350r unable to join the domain - what now?

    Hi all!

    I hope you can give me some advice because at the moment I'm in a really silly situation, being probably locked out of my Iomega px12-350r.

    Here is what happened:

    * The device was successfully linked to my domain name Microsoft AD and worked with this config at least a year.

    * I expanded the storage matrix, 2 days adding 2 drives. Everything went well and the end of the expansion, the new total disk space is displayed correctly in the web administration interface.

    * After this, I restarted the device. After the reboot, I couldn't connect to the device more using my domain account. This account had administrative rights on the NAS and I connected on the NAS using this account before.

    * I don't alter the domain infrastructure.

    * I know that the device cannot join the domain more because I enabled e-mail notifications and he continues to send me "unable to join the domain".

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    * Connection using the usual accounts: doesn't seem to work once the device is connected to a domain.

    * Connection via SSH. Does not work, probably for the same reason as above.

    I wasn't yet:

    * The user manual mentions reset the admin password by pressing the reset on the back button. But this will only reset config (I'd be okay with it), or it will erase the data on the drives as well?

    I'm from the Germany. Despite having purchased a service plan 24 x 7 hotline support German will only redirect me to the hotline American which claim to do only office, no SIN px12. I'm kinda in the middle of nowhere now. ;-)

    Thanks for your help!

    Best regards

    Florian

    Hi André,.

    I fixed it without reboot - by chance.

    In a desperate attempt, I tried to connect using the domain administrator account - and it worked! I don't remember giving any px12 admin permissions to this user and I certainly don't connect to the device using this user before. But the account has permissions to create computer accounts in the ad, and in the moment when I logged in the computer account of the AD px12 updated password.

    I tell myself that the px12 has used the account admin for re - joining the domain. From the web interface, I could now do a sync AD and after that, all users of domain reworked.

    So, if anyone has the same problem, try connecting the device with any account that has administrative rights on the whole of the field, even if you have not used the account on the device before. It can work for you, too.

    Local accounts still do not work. I think that if the device is connected to a domain and the domain link is broken permanently, so it's only the reset button.

    Andrew Merci for your support!

    Best regards

    Florian

  • I cannot join the domain in my office with my home edition, Windows

    Anyone, please help me solve the problem please...

    I use Microsoft Windows Home Edition...

    I can't join the domain...

    If I open network connections, and then I click on advance and I choose network identification and then I click on edit, there is only the option of working group...

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    How do for pop up that way I can join domain in my office?

    I thank the of for anyone who can help me...

    Anyone, please help me solve the problem please...

    I use Microsoft Windows Home Edition...

    I can't join the domain...

    If I open network connections, and then I click on advance and I choose network identification and then I click on edit, there is only the option of working group...

    But if I opened that there is two option in windows proffesional came... First area and the second is the working group...

    How do for pop up that way I can join domain in my office?

    I thank the of for anyone who can help me...

    XP Home Edition is not supported to join a domain. XP Professional is.

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