Complex join and f.k. join
Hi Team,
In which cases we will go complex join in physical layer and f.k. join BMM layer.
thanks,
In the BMM layer its recommended to use Complex joins always, as in this case obiee will dynamically select
which Logical table sources to join together from the Logical tables, and put some intelligence in choosing this source. a FK join here would mean that obi has to always use the table sources specified even if it is not the optimum one.
Complex join is used in the physical layer when there is no direct foreign key - primary key relationship between tables e.g. >,< is required to join instead of =.
Similar Messages
-
CONNECT BY with CROSS JOIN and WHERE not executing as described in doc
Hello all,
please see these two statements. They are the same, but the 1st uses t1 INNER JOIN t2 while the snd uses a CROSS JOIN with WHERE.
The 2nd statement shows one row more than the first, but the CROSS JOIN with WHERE is the same as the INNER JOIN.
The result would be OK if Oracle did:
JOIN -> CONNECT BY PRIOR -> WHERE
But according to the docs it does:
JOIN (and WHEREs for JOINS) -> CONNECT BY PRIOR -> Rest of WHERE
See http://docs.oracle.com/cd/E11882_01/server.112/e26088/queries003.htm#SQLRF52332 for details. There it says:
Oracle processes hierarchical queries as follows:
A join, if present, is evaluated first, whether the join is specified in the FROM clause or with WHERE clause predicates.
The CONNECT BY condition is evaluated.
Any remaining WHERE clause predicates are evaluated.
+.....+
Is this a bug? I'd say yes, because it differs from the docs and it also is not what people are used to ("a,b WHERE" is the same as "a INNER JOIN b").
Thanks,
Blama
--Statement 1:
WITH t1
AS
(SELECT 1 a, 2 b FROM DUAL UNION ALL
SELECT 2 a, 3 b FROM DUAL UNION ALL
SELECT 3 a, 4 b FROM DUAL UNION ALL
SELECT 4 a, 5 b FROM DUAL UNION ALL
SELECT 5 a, 6 b FROM DUAL),
t2 AS
(SELECT 1 c FROM DUAL UNION ALL
SELECT 2 c FROM DUAL UNION ALL
SELECT 3 c FROM DUAL UNION ALL
SELECT 5 c FROM DUAL)
SELECT DISTINCT t1.a, t2.c, t1.b, level, SYS_CONNECT_BY_PATH(t1.a, '/') Path
FROM t1 INNER JOIN t2
ON t1.a = t2.c
CONNECT BY t1.a = PRIOR t1.b
START WITH t1.a = 1
ORDER BY
1,2,3;
--Result:
--1 1 2 1 /1
--2 2 3 2 /1/2
--3 3 4 3 /1/2/3
--Statement 2:
WITH t1
AS
(SELECT 1 a, 2 b FROM DUAL UNION ALL
SELECT 2 a, 3 b FROM DUAL UNION ALL
SELECT 3 a, 4 b FROM DUAL UNION ALL
SELECT 4 a, 5 b FROM DUAL UNION ALL
SELECT 5 a, 6 b FROM DUAL),
t2 AS
(SELECT 1 c FROM DUAL UNION ALL
SELECT 2 c FROM DUAL UNION ALL
SELECT 3 c FROM DUAL UNION ALL
SELECT 5 c FROM DUAL)
SELECT DISTINCT t1.a, t2.c, t1.b, level, SYS_CONNECT_BY_PATH(t1.a, '/') Path
FROM t1 CROSS JOIN t2
WHERE t1.a = t2.c
CONNECT BY t1.a = PRIOR t1.b
START WITH t1.a = 1
ORDER BY
1,2,3;
--Result:
--1 1 2 1 /1
--2 2 3 2 /1/2
--3 3 4 3 /1/2/3
--5 5 6 5 /1/2/3/4/5My details:
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE 11.2.0.2.0 Production
TNS for Solaris: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Productionblama wrote:
Hello Paul,
that means that "a,b" isn't the same as "a CROSS JOIN b".
I don't think that that is really the case.
Do you have docs on this one?No explicit docs just (my) logic - having said that, I suppose it is implied that if you are doing ANSI style joins, it's not the where clauses that
are specifying the join.
If you do t1,t2 where t1.a=t2.a then Oracle figures out the kind of join from the (relevant) where clauses and treats the other where clauses after the CONNECT BY.
If you do t1 cross join t2 where t1.a=t2.a then you are saying the join is completely specified by the CROSS JOIN - i.e it's Cartesian. Oracle doesn't look at the where clauses for this. Therefore
all where clauses are treated as 'other' and are evaluated after the CONNECT BY.
So, in my mind it's 10g that has the bug. -
Inner join and outer join in infosets
hi everyone,
i have a doubt in infosets...
when and why we use inner and outer joins(right outer join and left outer join) for infoset
please give a real time scenario........
Thanks in advance.
Bye.Hello,
Inner join:
For example, the requirement is to show all sales documents where you have delivery exists. In this case, you join both sales ods and delivery ods in a infoset as inner join. This will match the record against the reference documents and pull only matched records.
Outer Join:
Suppose you want to pull all billing/invoice details along with their FI documents related data in a report. Assume that always there might be a situation that invoice exists but not posted to FI, however, you want to have all billing documents details either it has FI document or not. In this case, you link both Billing data and FI document data in a outer join. This will pull all invoices data either FI document exists or not. Other words, you want to show one side of data always but adding additional details from differenent source if data exists.
Hope, it clarifies your doubt. Let me know if any questions.
Thanks
Viswa -
Could any one tell me how to do the left outer join or right outer join?
Could any one tell me how to do the left outer join or right outer join in Webi Rich Client? thanks.
we can do it in two ways
1. In web intelligence level on the query panel click the sql query and write the statement what ever u want there by modifying the existing statement.
2. In universe level select the fields in the two tables that you want to make join and create the join between two tables directly by joining field in table 1 to the field in the table 2 by drawing a line and double click on the line to view the join properties,then on join properties if we check the table 1 outer then it is left outer join if we check on table 2 outer then it will be the right outer join.after exporting the universe to the central sever we are now ready to use in web intelligence with out being changed anything in the sql query.
endorse me if it is useful.
thanks & regards
Sreekanth. -
What is the different between Logical complex join and Physical join?
hi,
Do somebody know what is the function different between logical complex join in BMM layer and physical join in physical layer?
Thanks.Thank you very much1
I understand their differentiation:
In the BMM Complex join (intelligent), means OBI picks the best way from possibly many different ways to join using physical join. FK join forces the same join always, which limits flexibility. -
Need complex query with joins and AGGREGATE functions.
Hello Everyone ;
Good Morning to all ;
I have 3 tables with 2 lakhs record. I need to check query performance.. How CBO rewrites my query in materialized view ?
I want to make complex join with AGGREGATE FUNCTION.
my table details
SQL> select from tab;*
TNAME TABTYPE CLUSTERID
DEPT TABLE
PAYROLL TABLE
EMP TABLE
SQL> desc emp
Name
EID
ENAME
EDOB
EGENDER
EQUAL
EGRADUATION
EDESIGNATION
ELEVEL
EDOMAIN_ID
EMOB_NO
SQL> desc dept
Name
EID
DNAME
DMANAGER
DCONTACT_NO
DPROJ_NAME
SQL> desc payroll
Name
EID
PF_NO
SAL_ACC_NO
SALARY
BONUS
I want to make complex query with joins and AGGREGATE functions.
Dept names are : IT , ITES , Accounts , Mgmt , Hr
GRADUATIONS are : Engineering , Arts , Accounts , business_applications
I want to select records who are working in IT and ITES and graduation should be "Engineering"
salary > 20000 and < = 22800 and bonus > 1000 and <= 1999 with count for males and females Separately ;
Please help me to make a such complex query with joins ..
Thanks in advance ..
Edited by: 969352 on May 25, 2013 11:34 AM969352 wrote:
why do you avoid providing requested & NEEDED details?I do NOT understand what do you expect ?
My Goal is :
1. When executing my own query i need to check expalin plan.please proceed to do so
http://docs.oracle.com/cd/E11882_01/server.112/e26088/statements_9010.htm#SQLRF01601
2. IF i enable query rewrite option .. i want to check explain plan ( how optimizer rewrites my query ) ? please proceed to do so
http://docs.oracle.com/cd/E11882_01/server.112/e16638/ex_plan.htm#PFGRF009
3. My only aim is QUERY PERFORMANCE with QUERY REWRITE clause in materialized view.It is an admirable goal.
Best Wishes on your quest for performance improvements. -
Diff bw complex join and physical join
hi all
Can sumbody explain me the all the differences between complex join and physical join in the admin tool
Thanks
ShobhitHi,
Suggest you to go through this link. It may be helpful in detail.
http://st-urriculum.oracle.com/obe/fmw/bi/biee/r1013/bi_admin/biadmin.html
Thanks,
Vengatesh. -
Complex folders join and copy.
hi all,
my problem:
i have table a column: id,price,type,part.
now the type column is separate the table to different matters.
what is best to do :
create 2 complex folder and drag my columns to each and add the appropriate condition to each one?
or
import the table twice to 2 different folders and range it (by type) in each of them. ?
last question:
how do I copy an item object to complex folder ,in a way that every time I change it in the source folder the changes applied to the complex folder ?
thanks doronhi all,
my problem:
i have table a column: id,price,type,part.
now the type column is separate the table to different matters.
what is best to do :
create 2 complex folder and drag my columns to each and add the appropriate condition to each one?
or
import the table twice to 2 different folders and range it (by type) in each of them. ?
last question:
how do I copy an item object to complex folder ,in a way that every time I change it in the source folder the changes applied to the complex folder ?
thanks doron -
What are the Pros and Cons while joining tables at DF and Universe level
Hi Experts,
I am new to Data federator designer. I need help on the below.
Could you please let me know the Pros and Cons while joining the source tables in data federator
And While joining the DF target tables in universe designer.
Regards,
GanaHi,
1. I have created target tables based on source tables with one to one mapping and then join all target tables in universe.
Ex: Source tables: Infocube text tables, fact tables and 3rd party data base table
Target tables:Target tables are same as source tables
--- Yes this is the way to create target Tables and join them in the universe.These target Tables gives you the flexibility like in future your requirement is to add one more object based on some calculation which is not possible in the universe so that time you can create one more column in the target table and do the calculation. at the same time if you are using source table you can not do anything.
2. Created single target table with all objects of source tables and merged all sources tables data.
Ex: Source tables: Infocube text tables, fact tables and 3rd party data base table
Target table: Single table.
--- This is bit complex structure to merge all tables data in the one target table.in this situation you have to put more efforts and it is more complex.basically this type of target table is useful when you are merging data by multiple source into single or creating one target table based on the union of tables by adding two mapping rules or more and you can not join tables in universe.
Better approach is first 1. create target tables based on the source tables and join them in the universe.
Thanks,
Amit -
Difference between physical join and logical join
Hi Gurus,
Can anyone tell me what is the difference between physical join and logical join
Thanks,
ChandraHi,
A physical join is at the physical layer and defines the join between two physical tables. Logical joins live at the BMM (logical) layer and define a join between two logical tables.
The important differentiation is that at the BMM layer you do not tell the OBIEE server how to do the join, you just tell it that there is a relationship between these two logical entities. When the server comes to this logical join it will use the information in the physical joins and decides how the two logical tables are joined together.
In BMM you use complex joins to establish which logical tables are joined which another, the OBI EE server will go to the physical level to search the physical join to make the query. You can also use physical joins in the BMM to override the join in the physical layer but only in very specific conditions.
If you also set complex join in the physical layer OBI EE won't be able to construct the physical query.
Hope this answers your question.
Award points if helpful.
Thanks,
-Amith. -
I am simply trying to run the following query:
select /*+ index (serialnumber trans) */ distinct device,
device_path||device hierarchy,
sn.serialnumber
from z_xfmr_levels z
left join serialnumber sn
on z.device = sn.transformergrid(+);
I am using Oracle 9i
z_xfmr_levels has 75,000 distinct rows
serialnumber has 204,000 distinct rows
The explain plan shows a hash join and a full table scan on both tables.
How can I get the query to use the index on the transformergrid field of the serialnumber table?user10441616 wrote:
I am simply trying to run the following query:
select /*+ index (serialnumber trans) */ distinct device,
device_path||device hierarchy,
sn.serialnumber
from z_xfmr_levels z
left join serialnumber sn
on z.device = sn.transformergrid(+);
I am using Oracle 9i
z_xfmr_levels has 75,000 distinct rows
serialnumber has 204,000 distinct rows
The explain plan shows a hash join and a full table scan on both tables.
How can I get the query to use the index on the transformergrid field of the serialnumber table?What makes you think an index access is more appropriate than the the two full scans and a hash join?
If you have some legitimate reason, please share ... if not, please read this http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:9422487749968 -
Using join and batch reading in the same query
Hi,
I wonder if it is possible to use "Joining" and "batch reading" in the same query.
For example I Have
A -> 1-1 B
A -> 1-1 B
B -> 1-M C
This is the case where I have two separate 1-1 relationships to the same class B from A. Toplink 10.0.3 can manage it nicely through joining.
Now, I would like to read a set of As (with its 2 Bs) and all Cs for each B.
It seems that the following configuration does not work:
A -> 1-1 B (use joining)
A -> 1-1 B (use joining)
B -> 1-M C (Batch read)
Any help would be greatly appreciated
Tony.James,
Would you be so kind to look at the following code?
Am I formulating it correctly to achieve my desired behavior?
Trip.class -> 1-1 PickupStop
Trip.class -> 1-1 DropoffStop
PickupStop and DropoffStop extend Stop and use same table (STOP)
Stop -> 1-M StopEvents
I would like to fetch all Trips, with their Stops and all StopEvents in 2 queries:
1. Trip joined with Stop
2. Batchread StopEvents
Code:
ReadAllQuery raq = new ReadAllQuery(Trip.class);
Expression qexp1 = new ExpressionBuilder();
Expression qexp2 = new ExpressionBuilder();
raq.addJoinedAttribute("pickupStop");
raq.addJoinedAttribute("dropoffStop");
raq.addBatchReadAttribute(qexp1.get("pickupStop").get("vStopEvents"));
raq.addBatchReadAttribute(qexp2.get("dropoffStop").get("vStopEvents")); -
Hi. I am just about to move from the UK to Kuwait. Will I have any problems using my iPhone 4 and able to join a local carrier using this device please?
If your phone is locked to a particular carrier, you must contact them to request they unlock it. Once they've taken care of that and you've followed the instructions to complete the unlock process, you will be able to use the phone elsewhere.
~Lyssa -
Problem with XMLTABLE and LEFT OUTER JOIN
Hi all.
I have one problem with XMLTABLE and LEFT OUTER JOIN, in 11g it returns correct result but in 10g it doesn't, it is trated as INNER JOIN.
SELECT * FROM v$version;
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
"CORE 11.2.0.1.0 Production"
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
--test for 11g
CREATE TABLE XML_TEST(
ID NUMBER(2,0),
XML XMLTYPE
INSERT INTO XML_TEST
VALUES
1,
XMLTYPE
<msg>
<data>
<fields>
<id>g1</id>
<dat>data1</dat>
</fields>
</data>
</msg>
INSERT INTO XML_TEST
VALUES
2,
XMLTYPE
<msg>
<data>
<fields>
<id>g2</id>
<dat>data2</dat>
</fields>
</data>
</msg>
INSERT INTO XML_TEST
VALUES
3,
XMLTYPE
<msg>
<data>
<fields>
<id>g3</id>
<dat>data3</dat>
</fields>
<fields>
<id>g4</id>
<dat>data4</dat>
</fields>
<fields>
<dat>data5</dat>
</fields>
</data>
</msg>
SELECT
t.id,
x.dat,
y.seqno,
y.id_real
FROM
xml_test t,
XMLTABLE
'/msg/data/fields'
passing t.xml
columns
dat VARCHAR2(10) path 'dat',
id XMLTYPE path 'id'
)x LEFT OUTER JOIN
XMLTABLE
'id'
passing x.id
columns
seqno FOR ORDINALITY,
id_real VARCHAR2(30) PATH '.'
)y ON 1=1
ID DAT SEQNO ID_REAL
1 data1 1 g1
2 data2 1 g2
3 data3 1 g3
3 data4 1 g4
3 data5 Here's everything fine, now the problem:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bi
PL/SQL Release 10.2.0.1.0 - Production
"CORE 10.2.0.1.0 Production"
TNS for HPUX: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
--exactly the same environment as 11g (tables and rows)
SELECT
t.id,
x.dat,
y.seqno,
y.id_real
FROM
xml_test t,
XMLTABLE
'/msg/data/fields'
passing t.xml
columns
dat VARCHAR2(10) path 'dat',
id XMLTYPE path 'id'
)x LEFT OUTER JOIN
XMLTABLE
'id'
passing x.id
columns
seqno FOR ORDINALITY,
id_real VARCHAR2(30) PATH '.'
)y ON 1=1
ID DAT SEQNO ID_REAL
1 data1 1 g1
2 data2 1 g2
3 data3 1 g3
3 data4 1 g4As you can see in 10g I don't have the last row, it seems that Oracle 10g doesn't recognize the LEFT OUTER JOIN.
Is this a bug?, Metalink says that sometimes we can have an ORA-0600 but in this case there is no error returned, just incorrect results.
Please help.
Regards.Hi A_Non.
Thanks a lot, I tried with this:
SELECT
t.id,
x.dat,
y.seqno,
y.id_real
FROM
xml_test t,
XMLTABLE
'/msg/data/fields'
passing t.xml
columns
dat VARCHAR2(10) path 'dat',
id XMLTYPE path 'id'
)x,
XMLTABLE
'id'
passing x.id
columns
seqno FOR ORDINALITY,
id_real VARCHAR2(30) PATH '.'
)(+) y ;And is giving me the complete output.
Thanks again.
Regards. -
when i update my software to 6.1.3(10B329)to I phone 4s the wifi is not working and not auto join the network that i have already connected to
First, grow up. Just because YOUR phone isn't working, doesn't mean Apple put out bad software. I've not had any difficulty, nor has anyone else I know. And just how is Apple risking lives with Bluetooth kits not working? It's YOUR decision to talk on the phone or text and drive. Not Apple's.
We're users here, volunteering our time to help others. Posts like yours, which are whiny and ranting, simply means we're likely to ignore you and not provide you with any help. Not to mention, it makes you look absolutely foolish.
Further making you look foolish is the fact that you haven't even asked a technical support question, nor have you provided anyone here with any troubleshooting steps you might have taken, including those recommended in the user guide.
Good luck getting help.
GDG
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