Modeling of the left outer join
Hello world
I'm tender hand to you guys for a modeling help
I have a FACT, the customers, the Dim_Date and CUST_ADDRESS of tables to model
Fact and the client are joined through CUST_ID
FACT and DATE are joined through DATE_ID
CUST_ADDRESS must be attached to the top of the model through CUST_ID, DATE_ID and this join must be Left outer because sometimes the address does not exist or is not current, which means DATE_ID could be different between Dim_Date and CUST_ADDRESS
If it were to join internal, model would have been easy, because of the outside left that I am unable to model, it's pretty good.
Application under
Select D.DATE, C.CUST_NAME, CA. ADDRESS, F.AMOUNT
Of
F FACT
JOIN THE
CUSTOMER C
ON C.CUST_ID = F.CUST_ID
JOIN THE
DIM_DATE D
ON F.DATE_ID = D.DATE_ID
LEFT OUTER JOIN
CUST_ADDRESS CA
ON C.CUST_ID = CA. CUST_ID AND C.DATE_ID = D.DATE_ID
Thanks in advance
When I add the CUSTOMER and in FACT LTS CUST_ADDRESS
Stop it!
Don't add CUSTOMER and CUST_ADDRESS in the FACT of LTS. Why would add you to the LTS DO?
You design a management model: CUSTOMER is a dimension and it has its own logical table this logic table join with a logical join in the activity diagram. Ditto for CUST_ADDRESS.
So the change, I missed earlier is CUST_ADDRESS contains no Cust_ID (ACTUALLY existing), but contains a Cust_NO, and the table to translate Cust_NO in Cust_ID is CUSTOMER?
No problem...
Let's start with a new alias of CUSTOMER (to keep more simple to understand at the moment), call as you want, but this new alias will be the link between the FACT and CUST_ADDRESS.
In LTS of the dimension 'Address', you have CUST_ADDRESS initially, add an inner join on the new alias that you created in the LTS of the CUSTOMER. So now your 'Address' logical dimension contains the Cust_NO and Cust_ID and this will make the join to FACT.
Between CUST_ADDRESS and the CLIENT, you can keep an inner join, because the target is not not for get the address of the customer, but is having the Cust_ID in the address line.
Give it a try at that.
But do not add these tables in the LTS, they are logical dimensions.
Tags: Business Intelligence
Similar Questions
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Get the error invalid identifier in the left outer join
I wrote a query and get the invalid identifier error during execution:
the exact error is: ORA-00904: "D". "" ACCT_NO ": invalid identifier
This query is not able to access the parent table alias in the subquery of the left outer join.
This is the query:
SELECT D.PROD_DESC_TX, BASE. ASSET_NUM, BASE. PROD_ID, BASE.NAME
OF TABLE1 D
LEFT OUTER JOIN
(
SELECT ASSET_NUM, PROD_ID, B.SID
FROM TABLE2 E
JOIN IN-HOUSE TABLE3 HAS IT E.PROD_ID = A.ROW_ID
JOIN INTERNAL TABLE 4 C ON A.PAR_PROD_INT_ID = C.ROW_ID
INTERNAL TABLE5 JOIN B ON C.ROW_ID = B.PAR_ROW_ID
AND B.TYPE = 'VALUE '.
AND B.NAME = 'VALUE '.
WHERE E.ASSET_NUM = ((CASE WHEN LTRIM (RTRIM (D.BANK_NO)) = '021 ' THEN '021' ELSE ' 020' END) |) LTRIM (RTRIM (D.APPL_CD)). LTRIM (RTRIM (D.ACCT_NO)))
) BASE ON ((CASE WHEN LTRIM (RTRIM (D.BANK_NO)) = '021 ' THEN '021' ELSE ' 020' END) |) LTRIM (RTRIM (D.APPL_CD)). LTRIM (RTRIM (D.ACCT_NO))) = BASE. ASSET_NUM
WHERE D.BANK_NO = 'VALUE '.
AND D.APPL_CD = 'VALUE '.
AND D.ACCT_NO = 'VALUE '.
Edited by: user648525 13 Sep, 2011 01:21I can easily look at your request at this time (using my iPhone on a train).
But trying out this line in the WHERE (the one with the invalid reference) clause in the main query.
Who is... in the view of inline, use only the logic of the join (the clauses).
Overflow the filtering logic (WHERE clause) to the main request. You may need to select some additional inline view columns to make these references work.
-
He had to know the right outer join using...
He had to know the right outer join using...
For example: first query left outer join for the emp table: SELECT EMPNO, ENAME, D.DEPTNO FROM EMP E, Department D WHERE the E.DEPTNO = D.DEPTNO)
Second query left outer join for the Dept table: SELECT EMPNO, ENAME, D.DEPTNO FROM EMP E, Department D WHERE the D.DEPTNO = E.DEPTNO)
In the example above I just Exchange where condition condition to get an outer join of two table with a left outer join itself. Wat is use right outer join, instead, I can swap the status of table name for the result. Please suggest...
Hello
chan001 wrote:
He had to know the right outer join using...
For example: first query left outer join for the emp table: SELECT EMPNO, ENAME, D.DEPTNO FROM EMP E, Department D WHERE the E.DEPTNO = D.DEPTNO)
Second query left outer join for the Dept table: SELECT EMPNO, ENAME, D.DEPTNO FROM EMP E, Department D WHERE the D.DEPTNO = E.DEPTNO)
In the example above I just Exchange where condition condition to get an outer join of two table with a left outer join itself. Wat is use right outer join, instead, I can swap the status of table name for the result. Please suggest...
The two examples above use the old syntax outer join of Oracle. (I guess there should be a sign inside the parentheses, e.g.. +)
... WHERE E.DEPTNO = D.DEPTNO (+)
)
The LEFT OUTER JOIN and RIGHT OUTER JOIN terms apply only to the ANSI join syntax, e. g.
.
.. FROM EMP E
DEPT LEFT OUTER JOIN D ON E.DEPTNO = D.DEPTNO
As Blushadow said above, there's no real point in having LEFT OUTER JOIN and RIGHT OUTER JOIN; What you can do with one (or a combination of both) can be done with the other. Most people use LEFT OUTER JOIN systematically and never use RIGHT OUTER JOIN.
There are situations where using a combination of the two would mean a little less striking, but only a little less and this kind of situation is very common, and one may wonder if the somewhat shorter code is more specific. I suggest that forget you RIGHT OUTER JOIN.
-
Hello world
I'm still trying to learn the SQL, and I can not specifically with the left outer join. I normally join tables using equijoin, but I don't get the right data set returns, and designed with the help of a left or right outer join would solve the problem...
Here is my SQL that works properly with 1 left outer join. I build the slow query in the SQL following, you will see where I see the error. I don't expect you to understand the data and the columns, I'm trying to join, I think the problems I encounter are related to syntax, and I hope that you can find where are my syntax errors.
Select
s.Name as "Pseudonym,"
SV.view_name as "name of the view.
s_view. Name
Of
s s_screen,
s_screen_view sv
outer join left s_view
WE (sv.view_name = s_view.name)
where
SV.screen_id = ' 1-866 A - 1X3LU' and
s.ROW_ID = sv.screen_id and
s.repository_id = ' 866 A-1-1"and
s_view.repository_id = ' A-1-1 866 ";
Here is the SQL code where I encounter the following error...
Error:
ORA-00904: "SV". "" View_name ": invalid identifier
00904, 00000 - '% s: invalid identifier '.
* Cause:
* Action:
Error on line: column 14: 7
Problematic SQL:
Select
s.Name as "Pseudonym,"
SV.view_name as "name of the view.
s_view. Name,
s_applet. Name as Applet
-b.SID like "name of the cmdlet.
Of
s s_screen,
s_screen_view sv,
wti s_view_wtmpl_it
outer join left s_view
WE (sv.view_name = s_view.name)
outer join left s_applet
WE (wti.name = s_applet.name)
where
SV.screen_id = ' 1-866 A - 1X3LU' and
s.ROW_ID = sv.screen_id and
s.repository_id = ' 866 A-1-1"and
s_view.repository_id = ' A-1-1 866 ";
Thanks in advance for your help.
Chris
> ORA-00904: "S_VIEW_WEB_TMPL." "" ROW_ID ": invalid identifier
I don't see this table in your FROM clause.
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Problem with XMLTABLE and LEFT OUTER JOIN
Hi all.
I have a problem with XMLTABLE and LEFT OUTER JOIN, in 11g it returns the correct result, but in 10g it doesn't, it is illustrated as a INNER JOIN.
This is all nice, now the problem: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
As you can see in 10g that I don't have the last row, it seems that Oracle 10 g does not recognize the LEFT OUTER JOIN.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 g4
Is this a bug?, Metalink says that sometimes we can have an ORA-0600, but in this case there is no error results returned, just incorrect.
Help, please.
Kind regards.What about try the original Oracle method for outer joins? Using (+) without the extra space
XMLTABLE(...COLUMNS ... id XMLTYPE PATH ... ) x, XMLTABLE(... PASSING x.id ...) (+) y -
Using Left Outer Join with reference
I have three tables.
Table 1: BOOK_DETAILS
Fields: BOOK_ID, BOOK_NAME
Table 2: BOOK_ISSUE_RECORD
Fields: BOOK_ID, USER_NAME
Table 3: BOOK_AUTHOR
Fields: BOOK_ID, AUTHOR_NAME
I must link table 1 and table 2 with a left outer join, because even if the book is not the questions to anyone, his name should come.
I have once again display the name of the author of books for each book.
I am able to create a query with the left outer join between table 1 and table 2. However, I am not able to give a reference to Table 3.
Can someone help me with this please.
Concerning
Hawkerselect d.book_name, a.book_author, i.user_name from book_details d join book_author a on (d.book_id = a.book_id) left join book_issue_recors i on (d.book_id = i.book_id) /SY.
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Show all dates between date range (time Dimension is left outer join)
All,
I did some research on this issue, but in all positions on date variables, date prompts and date filtering I have not seen one exactly to my question (perhaps that they are and I don't have my head around it properly yet).
My requirement of report is to allow a user to select a start date and an end of day. The report is expected to show the activity of these two days - AND display 0/null on days where there is no activity. This second part is where I am getting hung up.
The paintings in question are:
Timedim
EventFact
CustomerDim
My MDB is configured as follows:
Left outer join of Timedim EventFact
Inner join CustomerDim EventFact
If I run a report by selecting the DAYS of Timedim and an EventFact measure1 with range day 01/01/2010-31/12/2010... A record for each day and it looks perfect because of the left outer join between Timedim and CustomerDim.
But... If I add a CustomerDim field, Select TimeDim.DAY, CustomerDim.CUSTNAME, EventFact.MEASURE1, OBIEE returns only records for the days that have record EventFact.
This is due to the fact that the Timedim is always external joined in EventFact, but adding in fact CustomerDim OBIEE set up an inner join between tables that will only return data where there are data EventFact.
There is a way around it in this simple case, and that is to define the relationship between CustomerDim and EventFact as an outer join as well. This will give the desired effect (but an outer join between the two tables is not the real relationship) and I have add an extra dimension and add additional sources of logic to a single dimension in MDB it becomes complicated and messy.
Also, ive ruined with the definition of the conduct in the relationship table, etc... but he gave not the desired effect.
Has anyone ever met the need for force display all dates within a range specified with a fact table that does not have an entry for each date?
Thanks in advance.
K
Published by: user_K on April 27, 2010 11:32Hi there, the easiest way is to the LTS himself. Double-click your LTS, go to the tab with the column mappings. Make sure you have checked "show no mapped" column.
You should see your new dummy column in the list, in the central part of mapping (IE not the right) just enter 0, or launch the expression editor and enter 0 in there.
simple! -
Dear elders,
Firstly, sorry if my question is considered to be 'very novice' but I have this problem of confusion.
Can I use the left outer join with summary?
For example:
Work table
Table No.JobCode JobGroupCode 111A 1100 112B 1100 113C 1100 121A 1200 333F 3300
Activity tableJobGroupCode ParentCode 1100 1000 1200 1000 1300 1000 3300 3000
I want to choose with this resultJobcode Mandays 111A 5 112B 7 113C 3
All I did was:Job.JobCode Job.JobGroupCode JobGroup.Parentcode Mandays 111A 1100 1000 5 112B 1100 1000 7 113C 1100 1000 3 121A 1200 1000 0 333F 3300 3000 0
and I got was only jobcode activity table, not exactly what I want to get all the work table jobcode. Could you please tell me, where I was wrong?select j.jobcode, j.jobgroupcode, jg.parentcode, sum(a.mandays) from job j inner join jobgroup jg on j.jobgroupcode = jg.jobgroupcode left join activity a on j.jobcode = a.jobcode group by j.jobcode, j.jobgroupcode, jg.parentcode
result
Thank you very much.Job.JobCode Job.JobGroupCode JobGroup.Parentcode Mandays 111A 1100 1000 5 112B 1100 1000 7 113C 1100 1000 3
Published by: user11197113 on May 25, 2009 03:31
Published by: user11197113 on May 25, 2009 03:32Hello (and welcome!).
Edit
OK, try this:
select j.jobcode, j.jobgroupcode, jg.parentcode, NVL(sum(a.mandays),0) from job j inner join jobgroup jg on j.jobgroupcode = jg.jobgroupcode left join activity a on j.jobcode = a.jobcode group by j.jobcode, j.jobgroupcode, jg.parentcodeThat will give you this:
JOBC JOBG PARE SUM(A.MANDAYS) ---- ---- ---- -------------- 111A 1100 1000 5 112B 1100 1000 7 113C 1100 1000 3 121A 1200 1000 0 333F 3300 3000 0These are real results of your test data.
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Oracle: Use LEFT OUTER JOIN, but convert the data to an external list
Hello, all,.
I know it can be done; I just don't remember how I got it done, oh there are so many years.
Assumes that the tables exist for groups and individuals. People can belong to several groups.
SELECT g.groupName, p.lastName || ', ' || p.firstName as fullName FROM groups g LEFT OUTER JOIN groupPersonAssociation gpa ON gpa.groupID = g.groupID LEFT OUTER JOIN person p ON p.personID = gpa.personID ORDER BY g.groupName, fullName
This gives us:
Group One Alpha, Daniel Group One Bravo, Charles Group One Charlie, Chuck Group Two Beta, Alpha Group Two Delta, Bonnie Group Three Echo, Bunny Group Three Golf, Samuel Group Three November, Stan
How word the SQL to get the data as:
Group One Alpha, Daniel | Bravo, Charles | Charlie, Chuck Group Two Beta, Alpha | Delta, Bonnie Group Three Echo, Bunny | Golf, Samuel | November, Stan
V/r,
^_^
I finally thought to it. I was using incorrect keywords on Google.
SELECT g.groupName, LISTAGG(p.lastName || ', ' || p.firstName,' | ') WITHIN GROUP (ORDER BY g.groupName) "fullName" FROM groups g LEFT OUTER JOIN groupPersonAssociation gpa ON ggpa.groupID = g.groupID LEFT OUTER JOIN person p ON p.personID = gpa.personID GROUP BY g.groupName ORDER BY g.groupName, fullNameJust in case someone else is going through this same desire.
HTH,
^_^
-
left outer join and the where clause for the table to the right
I want to join two tables a and b, where a is a must and b is a result set in option. When I use a left outer join to a to b, I want to achieve:
1. Select a single column, two columns of b (not the join columns)
2 - even if theres no friendly on the join column does not return data from one.
3. If there is a match applies when the criteria on column b (table in option)
so, how can I avoid no_data_found in this case? When I apply where criteria for b, so it does not return the data from one, which is a must.Sounds like a regular outer join to me...
select a.col1, b.col2, b.col2 from tableA a left outer join tableB b on (a.id = b.id and b.colX = 'X') -
What is the difference between NOT IN and LEFT OUTER JOIN
Hello
I searched the difference between everywhere. But his powerlessness.
Please tell me the differences.
Thanks in advance
KVBIt's like comparing apples and oranges.
NOT IN - exclude all lines matching the condition NOT IN (beware of NULL values).
JOIN EXTERNAL - return of rows from the inner table even if there is no corresponding row in the outer table.
SQL> -- NOT IN SQL> with x as 2 (select 1 col1 from dual union all 3 select 2 col1 from dual union all 4 select 3 col1 from dual) 5 , y as 6 (select 1 col1 from dual) 7 select * 8 from x 9 where col1 not in (1,2); COL1 ---------- 3 SQL> -- NOT IN (subquery) SQL> SQL> with x as 2 (select 1 col1 from dual union all 3 select 2 col1 from dual union all 4 select 3 col1 from dual) 5 , y as 6 (select 1 col1 from dual) 7 select * 8 from x 9 where col1 not in (select col1 from y); COL1 ---------- 2 3 SQL> -- OUTER JOIN SQL> with x as 2 (select 1 col1 from dual union all 3 select 2 col1 from dual union all 4 select 3 col1 from dual) 5 , y as 6 (select 1 col1 from dual) 7 select * 8 from x 9 left outer join 10 y 11 on x.col1 = y.col1; COL1 COL1 ---------- ---------- 1 1 3 2 SQL> -- Maybe it helps to contrast LOJ with just JOIN? SQL> with x as 2 (select 1 col1 from dual union all 3 select 2 col1 from dual union all 4 select 3 col1 from dual) 5 , y as 6 (select 1 col1 from dual) 7 select * 8 from x 9 join y 10 on x.col1 = y.col1; COL1 COL1 ---------- ---------- 1 1 SQL> -
Hi Experts,
I have a requirement that says - see the chart for the past 10 days, regardless the presence data table in fact.
Lets consider an example - Time_dim product, are my dimension tables, Purchase_Order is my fact table.I did it for external Purchase_Order in left RPD with TIME_DIM and inner join with the PRODUCT table. and execution of query of exit-
Select T.Date, P.item, count (distinct PO.order_no)
TIME_DIM t, PRODUCT P, PURCHASE_ORDER PO
where T.date_key = PO.date_key
and P.item = in. agenda
and P.item = 'laptop ';The query generated by OBIEE left outer join, but when the condition P.item = "Notebook" included in the query, and if there are no orders for this product in one of the date, that date will not come in the result set.
the query to be generated by the OBIEE is-
Select T.Date, PO.item, count (distinct PO.order_no)
TIME_DIM t,.
(SELECT P.ITEM, IN. ORDER_NO
PRODUCT P, PO PURCHASE_ORDER
WHERE P.item = in. agenda
and P.item = 'Laptop') IN.
WHERE T.date_key = PO.date_key (+);How to design the RPD to achieve this. All pray to advise on this. Thanks in advance.
Thank you
ChantalHello
You are on 11.1.1.7?
I would say that your condition can be made without using external and maintenance of product and the standard between the FACT dimension, time inner join join.
If you enable your property analysis OBIEE "Include Null values" will automatically return all the elements of time and product matching your filter (so you'll need to add a filter on 'Date' to limit it to the last 10 days or you will have a unique day of your time dimension).
If you filter then on "Laptop", even if there is not a single value in order for "Laptop" in the last 10 days, he will be there on the screen.
Easy, clean and you keep your inner join between the facts and Dimensions.
Take a look at this example, I just did on SampleApp 406:
Selection of 12 months (year 2010) and a customer (id = 89) and income. The model has only an inner join. I activate the option "Include Null values" and here is the result.
A line with cells only empty because there is not a single revenue for customer 89 in 2010. This is exactly your condition.
Honestly, do not touch your model using the outer join, you will have more side effects than benefits. Every single scan will do the outer join and you'll have a lot of data 'empty' return of the DB (more large data set containing just the null values) and probably you need the outer join in 15 to 25% of your analysis.
Keep things simple, it will be faster and easier to maintain.
-
Hi all
I use under version
Connected to Oracle Database 11g Express Edition Release 11.2.0.2.0
SQL > SELECT E.ENAME,.
2 D.DEPTNO,
3 D.LOC
4. TO EMP E,.
DEPT 5 D
6. WHERE = E.DEPTNO D.DEPTNO (+);
ENAME, DEPTNO LOC
---------- ------ -------------
DALLAS SMITH 20
ALLEN 30 CHICAGO
WARD 30 CHICAGO
20 DALLAS JONES
MARTIN 30 CHICAGO
BLAKE 30 CHICAGO
CLARK 10 NEW YORK
SCOTT 20 DALLAS
THE 10 NEW YORK KING
TURNER 30 CHICAGO
20 DALLAS ADAMS
JAMES 30 CHICAGO
FORD 20 DALLAS
MILLER 10 NEW YORK
40 BOSTON
15 selected lines
-----------------------------------------------------------------------------------------------------------------------------
SQL > SELECT E.ENAME,.
2 D.DEPTNO,
3 D.LOC
4. TO EMP E
5 LEFT OUTER JOIN
D 6 DEPT
7. THE E.DEPTNO = D.DEPTNO;
ENAME, DEPTNO LOC
---------- ------ -------------
MILLER 10 NEW YORK
THE 10 NEW YORK KING
CLARK 10 NEW YORK
FORD 20 DALLAS
20 DALLAS ADAMS
SCOTT 20 DALLAS
20 DALLAS JONES
DALLAS SMITH 20
JAMES 30 CHICAGO
TURNER 30 CHICAGO
BLAKE 30 CHICAGO
MARTIN 30 CHICAGO
WARD 30 CHICAGO
ALLEN 30 CHICAGO
14 selected lines
My doubt is both are same query is the same, is in ansi format and is in the format of the Oracle,.
but the results are different.
For the first query null is coming for unmatched records in the dept table
but in the second query, it does not come
Thank you
Hello
2947022 wrote:
Hi all
I use under version
Connected to Oracle Database 11g Express Edition Release 11.2.0.2.0
SQL > SELECT E.ENAME,.
2 D.DEPTNO,
3 D.LOC
4. TO EMP E,.
DEPT 5 D
6. WHERE = E.DEPTNO D.DEPTNO (+);
ENAME, DEPTNO LOC
---------- ------ -------------
DALLAS SMITH 20
ALLEN 30 CHICAGO
WARD 30 CHICAGO
20 DALLAS JONES
MARTIN 30 CHICAGO
BLAKE 30 CHICAGO
CLARK 10 NEW YORK
SCOTT 20 DALLAS
THE 10 NEW YORK KING
TURNER 30 CHICAGO
20 DALLAS ADAMS
JAMES 30 CHICAGO
FORD 20 DALLAS
MILLER 10 NEW YORK
40 BOSTON
15 selected lines
-----------------------------------------------------------------------------------------------------------------------------
SQL > SELECT E.ENAME,.
2 D.DEPTNO,
3 D.LOC
4. TO EMP E
5 LEFT OUTER JOIN
D 6 DEPT
7. THE E.DEPTNO = D.DEPTNO;
ENAME, DEPTNO LOC
---------- ------ -------------
MILLER 10 NEW YORK
THE 10 NEW YORK KING
CLARK 10 NEW YORK
FORD 20 DALLAS
20 DALLAS ADAMS
SCOTT 20 DALLAS
20 DALLAS JONES
DALLAS SMITH 20
JAMES 30 CHICAGO
TURNER 30 CHICAGO
BLAKE 30 CHICAGO
MARTIN 30 CHICAGO
WARD 30 CHICAGO
ALLEN 30 CHICAGO
14 selected lines
My doubt is both are same query is the same, is in ansi format and is in the format of the Oracle,.
but the results are different.
For the first query null is coming for unmatched records in the dept table
but in the second query, it does not come
Thank you
In fact, these requests are not the same.
The first is to find all the lines of the Department, with the corresponding lines of PGE (when there are). This is equivalent to «FROM dept LEFT OUTER JOIN emp...» ».
The second is to find all the rows in the emp of the lines of the Department (when there are any). This is equivalent to «...» WHERE e.deptno = d.deptno (+).
-
Bad result in a left outer join in 12.1.0.2
Hallo,
We discovered a strange behaviour in a query. The query provides values in a column of outer join where there is no corresponding value in the table is attached to the outside.
When you expand this request by the "ORDER BY" then this query gives the correct result.
Example:
SQL > desc tb_a
Name Null? Typ
-------------------------------------------- ----------------------------
ID NOT NULL NUMBER (19)SQL > desc tb_b
Name Null? Typ
-------------------------------------------- ----------------------------
CLOSED NOT NULL NUMBER (1)
ID NOT NULL NUMBER (19)CCS_APPLICATION@icw01> select * from tb_a where id in (4148,4141,4195);
ID
----------
4148
4141
4195CCS_APPLICATION@icw01> select * from tb_b where id in (4148,4141,4195);
INTERNAL ID
---------- ----------
4148 0CCS_APPLICATION@icw01> SELECT
2 b.id AS b_id,
3 a.id AS a_id,
4 b.closed AS b_closed
5
6 tb_a a
7 LEFT OUTER JOIN tb_b b ON a.id = b.id
8 WHERE a.id IN (4148, 4195, 4141)
9 ORDER BY ASC a.id
10;B_ID ALLOCATION A_ID B_CLOSED
---------- ---------- ----------
4141
4148 4148 0
4195CCS_APPLICATION@icw01> SELECT
2 b.id AS b_id,
3 a.id AS a_id,
4 b.closed AS b_closed
5
6 tb_a a
7 LEFT OUTER JOIN tb_b b ON a.id = b.id
8 WHERE a.id IN (4148, 4195, 4141)
9 - ORDER BY ASC a.id
10;B_ID ALLOCATION A_ID B_CLOSED
---------- ---------- ----------
4148 4148 0
4141 4141
4195 4195instance parameter:
VALUE OF TYPE NAME
------------------------------------ ----------- ------------------------------
compatible string 12.1.0.2.0
optimizer_features_enable string 12.1.0.2
After ""alter system set optimizer_features_enable = ' 11.2.0.4 ';" the query provides the correct result in both cases (ordered and unordered).
Now the final question: is this a bug?
1480970 wrote:
Hallo! Yes, I searched the Support of Oracle. I found some similar entries, but not an exact match. To fix some issues
with 12.1.0.2.
There is another interesting clue when look you on the execution plan:
Note
-----
-the dynamic statistics used: dynamic sampling (level = 2)
- This is an adaptation plan
We have disabled (= FALSE) optimizer_adaptive_features and the query provides the correct values.
This could be a solution for us.
Looks like a pretty tight match for bug 18430870, even if it affects the two 12.1.0.1 and 12.1.0.2, which contradicts the Martin trial against 12.1.0.1.
The description of the bug mentions disabling "_projection_pushdown" (set to false) should also be a viable solution, perhaps if you want to give that a try and see if it is a different bug or not.
There are also a number of one-time fixes already available for download, maybe your version / platform is already covered, if the bug applies.
Randolf
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Help for a LEFT OUTER JOIN query
Hello, all,.
I'm having some trouble setting up an Oracle 11 g Server SQL query, and I could use some help.
Let's say tableA is blogs; tableC is comments for blog entries; tableB is the associative array:
tableA blogID blogTitle blogBody dateEntered 1 This is a test More text... 2016-05-20 11:11:11 2 More testing Still more! 2016-05-19 10:10:10 3 Third charm!! Blah, blah. 2016-05-18 09:09:09
tableC commID userID userText dateEntered 10 Bravo I like it! 2016-05-20 11:21:31 11 Charlie I don't! 2016-05-20 11:31:51 12 Alpha Do it again! 2016-05-19 10:20:30 13 Bravo Still more? 2016-05-19 10:30:50 14 Charlie So, what? 2016-05-19 10:35:45 15 Bravo Blah, what? 2016-05-18 09:10:11 16 Alpha Magic number! 2016-05-18 09:11:13
tableB blogID commID 1 10 1 11 1 12 2 13 2 14 3 15 3 16
I'm trying to get blogID, blogTitle, blogBody and the number of comments for each blog entry. But, since I'm on to_char() for date and COUNT (commID) for the total number of comments, I am not "a group by expression.
Here is an example of pseudo-SQL of what I'm trying.
SELECT a.blogID, a.blogTitle, a.blogBody, to_char(a.dateEntered,'YYYY-MM-DD HH24:MI:SS') as dateEntered, COUNT(c.commID) as total FROM tableA a LEFT OUTER JOIN tableB b ON b.blog_ID = a.blog_ID LEFT OUTER JOIN tableC c ON c.commID = b.commID WHERE a.blogID = '1' GROUP BY blogID, blogTitle, blogBody ORDER BY to_date(dateEntered,'MM-DD-YYYY HH24:MI:SS') desc
I'm sure it's something simple, but I just DO NOT see it. Can you help me?
V/r,
^_^
Try:
GROUP BY a.blogID, a.blogTitle, a.blogBody, to_char(a.dateEntered,'YYYY-MM-DD HH24:MI:SS')
See you soon
Eddie
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