How to Left Join?

I want to perform the following join to merge data from 3 tables. Can I do this using the JOIN operator or is there another way to achieve this result in OWB?
INSERT INTO MERGETABLE (L1, L2, L3, L4)
SELECT T2.L1, T2.L2, T3.L3, T4.L4 FROM T4
LEFT JOIN T3 ON T3.L3=T4.L3
LEFT JOIN T2 ON T2.L2=T3.L2

I seem to be able to achieve the desired result by JOINing T4 and T3 on T3.L3=T4.L3 into a table TEMP and then JOINing TEMP with T2 on TEMP.L2=T2.L2. However this seems to be more complicated than necessary. Can I achieve the same result in OWB in a single step as with the original SQL command?

Similar Messages

Query problem, two working queries how to left join together?

Hello,
I have a two queries that I have been trying to put together for a couple days. I'm frazzled. Hopefully you can help.
The first query returns all rows from the database. The second query returns only one row (because the way it is currentlly set up in the Where clause). So I know that will have to change. For each row returned in Query1, I need the two fields from Query2 included
(so the link would be through client.Id (which is an indexed field) or client.Accountnumber?
This query, returns all records in the database:
Select client.Id, client.accountnumber, client.Namelast,
dmlocation.city ||', '||dmlocation.state as CityState,
client.salesTerritory_client ||'-'|| dmuser.namefirst_user ||' '|| dmuser.namelast_user as Territory,
MaxDates.LastRun, client.creditrisk, client.customercategory
from client
Left join fctclientcoverage on fctclientcoverage.client_id = client.id
Left join dmlocation on fctclientcoverage.location_id = dmlocation.id
Left join dmuser on dmuser.id = client.id
Left join (Select to_char(Max(dmdate.calendardate),'MM/DD/YY') as LastRun, Client.Id
from dmdate, client, fctadorder
where dmdate.id = fctadorder.lastinsert_date_id and client.id = fctadorder.primaryorderer_client_id
group by client.id) MaxDates ON client.id = MaxDates.Id
where(fctclientcoverage.Ccoverrecordstopdate Is Null)
Order by client.namelast;
Query 2, only returns 1 row, so for each row returned above, the two fields selected in this query should accompany each row. But how to link these two selects using the client.accountnumber (or perhaps by dmcliet.id)?
Select booked.CurRev, booked.LastRev from (
Select (sum(Case When dmDate.CalendarDate >= '29-DEC-2008' and dmDate.CalendarDate < '
Then fctinsertchargedetail.Amount_insertDetail Else 0 End)) As CurRev,
(sum(Case When dmDate.CalendarDate >= '29-DEC-2007' and dmDate.CalendarDate < '
Then fctinsertchargedetail.Amount_insertDetail Else 0 End)) As LastRev
from fctAdorder
Inner Join client On fctAdorder.primaryorderer_client_id = client.id
Inner Join fctinsertion On fctAdorder.id=fctinsertion.fctAdorder_id
Inner Join fctinsertchargesummary On fctinsertion.id=fctinsertchargesummary.insertion_id
Inner Join dmDate On fctinsertion.insert_date_id=dmDate.id
Inner Join fctinsertchargedetail On fctinsertchargesummary.id=fctinsertchargedetail.insertchargesummary_id
WHERE client.accountnumber = '12345678' and
dmDate.CalendarDate >= '29-DEC-2007' And dmDate.CalendarDate < ') booked;
Thanks for your time.

Yes, You are correct!
I just recently got the query working with the aid of another forum.
The sad part is, all though the first query took 11 seconds to return 180,000 rows (thats good); The second query took 4 minutes to calculate and return all it's rows (that's bad). Together the query ran for over 4 minutes. Way too slow.
Being brand new to oracle I have to try and figure away to cut this time down. Perhaps I'm not considering something?
I orginally brought into my .net app the results from the first query and then in the rowdatabound event I queried each row to get the information needed from the second query. That was way too slow also. It was recommended to try and return all needed data at once.
I've been given a task to emulate a current application, (which I do not have access to it's code), that brings back all of this same information that I am using. It only takes them maybe 15 seconds to run, to bring back all. Of course they were experienced oracle sql developers.
So I guess my next step is to try and improve that second query. Thanks for replying to this Frank. I'll be back. Are you or is anyone good at knowing how to optimzie queries? I'm reading a book now trying out suggestions. Nothing is working yet.
thanks

How to generate a query involving multiple tables(one left join others)

Hi, all,
I want to query a db like these:
I need all the demographics information(from table demo) and their acr info(from table acr), and their clinical info(from table clinical), and their lab info(from table lab).
The db is like this:
demo->acr: one to many
demo->clinical info: one to many
demo->lab info: one to many
I want to get one query result which are demo left join acr, and demo left join clinical, and demo left join lab. I hope the result is a record including demo info, acr info, clinical info, and lab info.
How could I do this in SQL?
Thanks a lot!
Qian

Thank you very, very much!
Actually, I need a huge query to include all the tables in our db.
We are running a clinical db which collects the patients demographics info, clinical info, lab info, and many other information.
The Demographics table is a center hub which connects other tables. This is the main architecture.
My boss needed a huge query to include all the information, so others could find what they need by filtering.
As you have found, because one patients usually has multiple clinical/lab info sets, so the result will be multiplied! the number of result=n*m*k*...
My first plan is to set time point criteria to narrow all the records with one study year. If somebody needs to compare them, then I have to show them all.
So I have to know the SQL to generate a huge query including as many tables as possible.
I show some details here:
CREATE TABLE "IMMUNODATA"."DEMOGRAPHICS" (
"SUBJECTID" INTEGER NOT NULL,
"WORKID" INTEGER,
"OMRFHISTORYNUMBER" INTEGER,
"OTHERID" INTEGER,
"BARCODE" INTEGER,
"GENDER" VARCHAR2(1),
"DOB" DATE,
"RACEAI" INTEGER,
"RACECAUCASIAN" INTEGER,
"RACEAA" INTEGER,
"RACEASIAN" INTEGER,
"RACEPAC" INTEGER,
"RACEHIS" INTEGER,
"RACEOTHER" VARCHAR2(50),
"SSN" VARCHAR2(11),
PRIMARY KEY("SUBJECTID") VALIDATE
CREATE TABLE "IMMUNODATA"."ACR" (
"ID" INTEGER NOT NULL,
"THEDATE" DATE ,
"SUBJECTID" INTEGER NOT NULL,
"ACR_PAGENOTCOMPLETED" VARCHAR2(1000) ,
"ACR_MALARRASHTODAY" INTEGER ,
"ACR_MALARRASHEVER" INTEGER ,
"ACR_MALARRSHEARLIESTDATE" DATE ,
PRIMARY KEY("ID") VALIDATE,
FOREIGN KEY("SUBJECTID") REFERENCES "IMMUNODATA"."DEMOGRAPHICS" ("SUBJECTID") VALIDATE
CREATE TABLE "IMMUNODATA"."CLIN" (
"ID" INTEGER NOT NULL,
"THEDATE" DATE ,
"SUBJECTID" INTEGER NOT NULL,
"CLIN_PAGENOTCOMPLETED" VARCHAR2(1000) ,
"CLIN_FATIGUE" VARCHAR2(20) ,
"CLIN_FATIGUEDATE" DATE ,
"CLIN_FEVER" VARCHAR2(20) ,
"CLIN_FEVERDATE" DATE ,
"CLIN_WEIGHTLOSS" VARCHAR2(20) ,
"CLIN_WEIGHTLOSSDATE" DATE ,
"CLIN_CARDIOMEGALY" VARCHAR2(20) ,
PRIMARY KEY("ID") VALIDATE,
FOREIGN KEY("SUBJECTID") REFERENCES "IMMUNODATA"."DEMOGRAPHICS" ("SUBJECTID") VALIDATE
Other tables are alike.
Thank very much!
Qian

How can I add left join in the coding

I intend to dynamic add left jion in my java class.
so I write the coding like below:
incident_id = svc_yokyu_id(+)
(Both of them have been selected in the select sentence.)
However, when I run the app, it will throw a sql error.(ora-01416)
then I copy the error sql sentence and try to test it
QRSLT WHERE (incident_id = svc_yokyu_id(+))--this is a error sql sentence.
Finding that if I delete the left join,(+), the sql will run right,
or I modify the sql like
QRSLT WHERE incident_id in (Select svc_yokyu_id from xxfm_srl_sr_jc_relation xssjr where incident_id = xssjr.svc_yokyu_id(+)) , it run right as well.
according to bussiness requestion, I can't write the coding like above,
so, i don't know how to implement it.
and i hope to your advice. thx

Does a hand come out of the screen, grabbing you by the wrist, every time you try?
Just guessing…
Peter

How To do a LEFT JOIN in Oracle 8i

Hello
To explain my problem in a simple way: I have two tables, PROVA1 and PROVA2. Both have a primary key with two fields (CHIAVE1 amd CHIAVE2, numbers).
I have to search for all records in A but not in B. In Oracle 8 LEFT JOIN is not available and I do not Know how doing it.
I have read something about + operator, but I am not sure. What about:
Select * from PROVA1 P1, PROVA2 P2 where
(P1.CHIAVE1(+) = P2.CHIAVE1) and
(P1.CHIAVE2(+) = P2.CHIAVE2) and
(P2.CHIAVE1 IS NULL) and
(P2.CHIAVE2 IS NULL)
Thank you
Garetano Recchi

Gaetano, you're really close.
The (+) sign goes near to the table where the records can be missed. In your example near P2 columns.
Select *
from PROVA1 P1, PROVA2 P2
where P1.CHIAVE1 = P2.CHIAVE1(+)
and P1.CHIAVE2 = P2.CHIAVE2(+)
and P2.CHIAVE1 IS NULL
and P2.CHIAVE2 IS NULLYou can anyway use the minus operator
Select *
from PROVA1
where (chiave1,chiave2) in (select chiave1, chiave2 from prova1 minus select chiave1, chiave2 from prova2);If you want to download a free book (in italiano) for oracle beginners go to
My Oracle-related blog
Max

How to create a left join view in se11??

I would like to create a view which contains KNA1,KONA,KNVV,KNVH(four tables) , I want to use this view to create a search help for Tcode 'VBO3'.
but when I join table KNVH, there is no data in view, because there is no customer hierarchy, so I want to create a left join view. could you please tell me how to create a left join view? Thank you very much.

Hello,
yes, in general, maint. view and help view could be created as outer join view.
but it should obey relationship.
my fourt tables:
KONA -
> I want to get agreement number and type from this table
KNA1 -
>I want to get customer name, city, country from this table
KNVH -
>I want to get customer hierarchy from this table.
KNVV -
>I want to get customer group 1 from this table.
but in help view, I can only get relationship between KONA and KNA1.
I could not find the relationship for KNVH and KNVV.
if it's required to add a search help exit, then how to write the code in the function?
Could somebody please give me any solutions? thank you.

How to make a customize form with optional parameter and left join

Hi,
I am trying to make a report with a left join. I also want ot have optional parameters in it.
I am using the Create Reports From SQL Query method:
SQL is :
select ename, sal
from scott.emp left join scott.dept
on scott.emp.deptno = scott.dept.deptno
where sal >= :lower_sal
and sal <= :higher_sal;
However, if I do it this way, I those 2 parameters are not optional.... How can I make them optional?
If I use the Create Reports From Query Wizard method, I can make the parameters optional, but then I cannot do the left join...
Thanks,
Wilson

hi,
to catch null values on both sides I use:
where nvl(sal,0) >= nvl(:lower_sal,nvl(sal,0))
and nvl(sal,0) <= nvl(:higher_sal,9999999999)
otherwise there will be no rows in the report where the value of sal is null, even if there are no selection criteria entered.
regards Michael

How to do inner join ,outer join, left join ,right join by using infoset

how to do inner join ,outer join, left join ,right join by using infoset

Hi
If you want to make join ,outer join, left join ,right join then its possible if you are using ODS or direct infoobject (In BW3.5) and if you are using BI7.0 then you also make join ,outer join, left join ,right join with Cube also.
For making join ,outer join, left join ,right join in infosets you just select your info provider then right click on your infoarea from context menu select info set after doing this one pop-up opens here u define your infoset technical name and give either ODS object name of infoobject name.
After doing this next screen opens in right hand side your selectes ODS or infoobject shows in graphical format .
and left hand side it shows one menu bar here you can select another ODS or infoobject for making join ,outer join, left join ,right join .just click on ODS button in menu bar and select ODS drag your selected ODS from Left to right after doing this your selected ODS shown in right hand side window in graphical format you just now after doing this you are able to make join ,outer join, left join ,right join for this first you select field from one ods and drag a line from 1 ods to second ods after doing this one arrow is created from one ods to another ods just right click on arrow and make join ,outer join, left join ,right join in to your ODS.
I think its clear how we can we make join ,outer join, left join ,right join in infoset.If you have any further query then welcome.
Assign Points...............
Thanks and regards
Ankit modi

How to use LEFT JOIN in LINQ

I have this query in Oracle and I am trying to write a Linq query for this below sql. There are 2 datatables DATA_TABLE1 and DATA_TABLE2. Both tables have 2 fields ID1 and ID2.
SELECT A.ID1, A.ID2
FROM DATA_TABLE1 A
LEFT JOIN DATA_TABLE2 B
ON A.ID1 = B.ID1 AND A.ID2 = B.ID2
WHERE B.ID1 IS NULL OR B.ID2 IS NULL

In order to see what query the data provider sent to the server you can do the following.
Just after creating the data context place this line in the code.
db.Database.Log = Console.Write;
Then place a breakpoint after the next line of code, shown next.
var
a =
db.product.Where(p
=>
p.Name.Contains(asKeyword)).ToList();
Then run the application and when it hits the breakpoint open the Visual Studio Output window and the SQL sent to the server should be displayed.
Fernando (MCSD)
If a post answers your question, please click "Mark As Answer" on that post and "Mark as Helpful".
NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects
and unknown namespaces.

How to do a left join to create a timesheet status report in Power View

I am trying to create a very simple report in power view for Project Online. It's a timesheet status report that should show a list of resources, and the current status of their timesheet (in progress, not started, etc).
In Excel, I created an odata connection with Resources and Timesheets, and set up the connection between them. So, I can now easily display a list of timesheets, and filter them by end date. Good. But this only displays rows where there is an existing timesheet.
So resources who have not started a timesheet are not displayed. So, I need a "left join" in power view to display all resources, whether or not they have a timesheet for the period. (and, for the ones that do, I need to display fields from the timesheet,
such as the status description.)
Any suggestions?
Mike G.

Hi Mike,
I'm not sure of what I'm suggesting since I got no instance to test it, but I'm wondering if the OLAP Cube "MSP_Project_Timesheet" wouldn't contain all resources of the enterprise pool with assignments (and not only resources that already submitted
a timesheet) since it is a combination of the assignment timephased, resource timephased and EPM timesheet cubes.
Hope this helps.
Guillaume Rouyre - MBA, MCP, MCTS

How to implement left join for the below sql.

i need to perform left join between inventory table and purchase table and inventory table with sales table.
please let me know the syntax.
SELECT Tbl_ProductGroupMaster.ProdName, Tbl_ProductGroupMaster.UnitNam, Tbl_Inventory.CrDate, Tbl_Inventory.QtyOpStk, Tbl_Inventory.QtyClStk, Tbl_Inventory.ExcShortage, purchase.SumOfNUnit, sales.SumOfQty
FROM Tbl_ProductGroupMaster, Tbl_Inventory left join
[SELECT Tbl_PurchaseMain.idate as p_idate, Tbl_PurchaseSub.Proid as proid,
sum(Tbl_PurchaseSub.NUnit) AS SumOfNUnit
FROM Tbl_PurchaseMain, Tbl_PurchaseSub WHERE Tbl_PurchaseMain.GID=Tbl_PurchaseSub.gid
and format(cdate(Tbl_PurchaseMain.idate),'mm-dd-yyyy') between format(cdate('13-Sep-2009'),'mm-dd-yyyy') and
format(cdate('02-Oct-2009'),'mm-dd-yyyy') GROUP BY
Tbl_PurchaseMain.idate, Tbl_PurchaseSub.Proid]. AS purchase on (Tbl_Inventory.CrDate = purchase.p_idate)
left join
[SELECT Tbl_SalesMain.idate AS s_idate, Tbl_SalesSub.Proid, sum(Tbl_SalesSub.Qty) AS SumOfQty
FROM Tbl_SalesMain, Tbl_SalesSub
WHERE Tbl_SalesMain.SAID=Tbl_SalesSub.SAID And
format(cdate(Tbl_SalesMain.idate),'mm-dd-yyyy') Between format(cdate('13-Sep-2009'),'mm-dd-yyyy') And
format(cdate('02-Oct-2009'),'mm-dd-yyyy')
GROUP BY Tbl_SalesMain.idate, Tbl_SalesSub.Proid]. AS sales on (Tbl_Inventory.CrDate = sales.s_idate)
WHERE
Tbl_ProductGroupMaster.PROID=Tbl_Inventory.proid AND
Tbl_Inventory.PROID=purchase.proid and
Tbl_Inventory.PROID=sales.proid and
Tbl_Inventory.CrDate = '13-Sep-2009';
thanks,
Vinodh

Completely unstested as you haven't given much information but do you mean something like this?
WITH purchase
       AS ( SELECT   Tbl_PurchaseMain.idate AS p_idate,
                      Tbl_PurchaseSub.Proid AS proid,
                      SUM (Tbl_PurchaseSub.NUnit) AS SumOfNUnit
               FROM   Tbl_PurchaseMain, Tbl_PurchaseSub
              WHERE   Tbl_PurchaseMain.GID = Tbl_PurchaseSub.gid
                      AND format (cdate (Tbl_PurchaseMain.idate), 'mm-dd-yyyy') BETWEEN format (
                                                                                           cdate('13-Sep-2009'),
                                                                                           'mm-dd-yyyy'
                                                                                    AND format (
                                                                                            cdate('02-Oct-2009'),
                                                                                            'mm-dd-yyyy'
           GROUP BY   Tbl_PurchaseMain.idate, Tbl_PurchaseSub.Proid),
    sales
       AS ( SELECT   Tbl_SalesMain.idate AS s_idate,
                      Tbl_SalesSub.Proid,
                      SUM (Tbl_SalesSub.Qty) AS SumOfQty
               FROM   Tbl_SalesMain, Tbl_SalesSub
              WHERE   Tbl_SalesMain.SAID = Tbl_SalesSub.SAID
                      AND format (cdate (Tbl_SalesMain.idate), 'mm-dd-yyyy') BETWEEN format (
                                                                                        cdate('13-Sep-2009'),
                                                                                        'mm-dd-yyyy'
                                                                                 AND format (
                                                                                         cdate('02-Oct-2009'),
                                                                                         'mm-dd-yyyy'
           GROUP BY   Tbl_SalesMain.idate, Tbl_SalesSub.Proid)
SELECT   Tbl_ProductGroupMaster.ProdName,
         Tbl_ProductGroupMaster.UnitNam,
         Tbl_Inventory.CrDate,
         Tbl_Inventory.QtyOpStk,
         Tbl_Inventory.QtyClStk,
         Tbl_Inventory.ExcShortage,
         purchase.SumOfNUnit,
         sales.SumOfQty
FROM   Tbl_ProductGroupMaster,
       Tbl_Inventory LEFT OUTER JOIN purchase
                     ON Tbl_Inventory.CrDate = purchase.p_idate
                     LEFT OUTER JOIN sales
                     ON Tbl_Inventory.CrDate = sales.s_idate
WHERE Tbl_ProductGroupMaster.PROID = Tbl_Inventory.proid
AND   Tbl_Inventory.PROID = purchase.proid
AND   Tbl_Inventory.PROID = sales.proid
AND   Tbl_Inventory.CrDate = '13-Sep-2009';Cheers
Ben
http://www.munkyben.wordpress.com

How do u write a LEFT JOIN in Oracle Developer Forms 6i?

I have 2 tables:PERSDET and EMP_MEDICAL_LTA
PERSDET has EMP_ID,EMP_NAME n some other fields.
EMP_MEDICAL_LTA has EMP_ID,FIELD1,FIELD2 n some other fields
EMP_ID is the common field between these 2 tables.
My requirement is to display all the EMP_NAME,that is-EMP_NAME which have field1 and field2 entries, as well as EMP_NAME which donot have field1 and field2 entries. I thought of using a LEFT join for this operation. The query I used is as follows:
SELECT PERSDET.emp_id,PERSDET.emp_name,EMP_MEDICAL_LTA.field1,EMP_MEDICAL_LTA.field2 into emp_id,emp_name,m,l FROM
PERSDET LEFT JOIN EMP_MEDICAL_LTA ON PERSDET.emp_id=EMP_MEDICAL_LTA.EMP_ID
where <some other joining conditions>;
This query worked perfectly fine when I tried it running on the SQL prompt, but when I wrote it in a cursor in Oracle Forms 6i, it gave an error on the LEFT keyword!
Is there any substitute for LEFT JOIN in Oracle Forms 6i???
Please help!
Thanks!

hi,
yes it is very much possible. and you query willbe as follows;
SELECT PERSDET.emp_id,PERSDET.emp_name,EMP_MEDICAL_LTA.field1,EMP_MEDICAL_LTA.field2 into emp_id,emp_name,m,l FROM
PERSDET where PERSDET.emp_id=EMP_MEDICAL_LTA.EMP_ID(+)
where <some other joining conditions>;
yse, you just have to use (+) symble on the side where the join condition is not fullfilled. the 2 possibilites for your qury is PERSDET.emp_id=EMP_MEDICAL_LTA.EMP_ID(+)
PERSDET.emp_id(+)=EMP_MEDICAL_LTA.EMP_ID
you can execute both and suit your self.
MohibMaan.

Left Join query: revisited... I have to explain at user meeting tomm. pls..

Hi Everyone,
Can someone pls shed some light on the situation below
I am understanding alot of what Michael and Rod wrote.... with my prev. post of LEFT JOIN and testing for
not null and doing a double Boolean OR etc.
- but- AM NOT understanding why the IS NOT NULL works, without the double boolean OR
Pls help... have to explain what left join means to user tomm. I'm going to demo the query below and
not the one with the double boolean OR bec. maybe too much info to present at one sitting. tx, sandra
=====================
the query below is left joining the STUDENT table to
HOLD table.
The HOLD table - contains rows for students who have holds on their record.
a student can have more than one hold (health, HIPAA, basic life saving course)
BUT, for this query: I'm only interested that a hold exists, so I'm choosing MAX on hold desc.
Selecting a MAX, helps me, bec. it reduces my join to a 1 to 1 relationship, instead of
1 to many relationship.
Before I posted this thread at all, the LEFT JOIN below testing for IS NOT NULL worked w/o
me having to code IS NOT NULL twice....
Is that because, what's happening "behind the scenes" is that a temporary table containing all max rows is being
created, for which Discoverer has no predefined join instructions, so it's letting me do a LEFT JOIN and have
the IS NOT NULL condition.
I would so appreciate clarification. I have a meeting on Tues, for which I have to explain LEFT JOINS to the user
and how they should create a query. I need to come up with rules.
If I feel "clear", I asked my boss to buy Camtasia videocast software to create a training clip for user to follow.
Also, if any Banner user would like me to email the DIS query to run on their machine, I would be glad to do so.
thx sooo much, Sandra
SELECT O100384.ACADEMIC_PERIOD, O100255.ID, O100384.ID, O100255.NAME, O100384.NAME, O100255.PERSON_UID, O100384.PERSON_UID, MAX(O100255.HOLD_DESC)
FROM ODSMGR.HOLD O100255, ODSMGR.STUDENT O100384
WHERE ( ( O100384.PERSON_UID = O100255.PERSON_UID(+) ) ) AND ( O100384.ACADEMIC_PERIOD = '200820' )
GROUP BY O100384.ACADEMIC_PERIOD, O100255.ID, O100384.ID, O100255.NAME, O100384.NAME, O100255.PERSON_UID, O100384.PERSON_UID
HAVING ( ( MAX(O100255.HOLD_DESC(+)) ) IS NOT NULL )
ORDER BY O100384.NAME ASC

Hi,
OK, I will try to explain this. When you outer join table B to table A then the rows in table A which do not match any rows in table B will returned with NULL in the columns from the table B.
Oracle uses the syntax ( +) for outer joins. Now if you add another condition using the ( +) syntax (as shown below) the condition will be processed before the table is joined. Therefore if table A does not match any rows in table B which have col2=1 then the row from table A will be returned with NULLs for the table B columns.
SELECT A.col1, B.col1
FROM A, B
WHERE A.col1 = B.col1( +)
AND B.col2( +)=1
Now, if the condition B.col2=1 was used instead then the condition would be processed after the join and therefore the rows from table A that were joined to table B but did not meet the condition would not be returned by the query.
This applies to a WHERE clause and to the HAVING clause, but with one exception. If you use the ( +) within a group function in a HAVING clause then the ( +) will have no affect because the condition must be processed after group by and group by can only be processed after the join. Therefore MAX(B.col2( +)) = 1 is processed after the join even through it uses the ( +) syntax.
You cannot use an OR or an IN with the ( +) syntax because the meaning of the OR in this situation is ambiguous, is the OR done before or after the join. A query with an OR or IN in an outer will fail with an Oracle ORA-01719 error. Discoverer recognises this situation and removes the ( +) so that the error does not occur. However, without the ( +) the conditions are processed after the join.
Using the ( +) with IS NULL, e.g. col2( +) IS NOT NULL works in the same way. You just have to remember that the col2( +) could be NULL as a result of the outer join and therefore if the condition is processed after the query then the IS NOT NULL will remove the outer joined rows.
Hope that is clear.
Rod West

Left joins on multi-million rows

i have a simple query doing left joining on several tables, upward of 7 tables. each table has several hundred million rows.
tblA is 1:M tblB and tblB is 1:M tblC and so on.
how to tune a query liked that?
sample query is
select distinct
a.col,b.col,c.col
from tblA a left join tblB b
on a.id=b.id
and a.col is not null
left join tblC
on b.id=c.id
and c.col > criteria
thanks.

hi
a simple query is liked
SELECT my_DEP.description,
my_DEP.addr_id,
hundredRowsTbl.address,
5MillTbl.checkin_TIME,
5MillTbl.checkout_TIME,
hundredRowsTbl.ID2,
5MillTbl.ID,
5MillTbl.col2,
my_DEP.col3,
5MillTbl.col13,
hundreds.desc,
50mmTbl.col6,
50mmTbl.col5,
5MillTbl.col33
FROM
my.5MillTbl 5MillTbl
LEFT OUTER JOIN
my.50mmTbl 50mmTbl
ON 5MillTbl.ID = 50mmTbl.ID
LEFT OUTER JOIN my.hundreds hundreds
ON 5MillTbl.banding =
hundreds.banding
INNER JOIN my.my_DEP my_DEP
ON 5MillTbl.organization_ID = my_DEP.organization_ID
INNER JOIN my.my_40millTbl
ON 5MillTbl.seqID = my_40millTbl.seqID
LEFT OUTER JOIN my.hundredRowsTbl hundredRowsTbl
ON my_DEP.addr_id = hundredRowsTbl.ID2
LEFT OUTER JOIN my.30millTbl 30millTbl
ON my_DEP.organization_ID = 30millTbl.dept_id
WHERE 1=1
AND 5MillTbl.ID IS NOT NULL
AND ( 5MillTbl.checkout_TIME >= TO_DATE ('01-01-2009 00:00:00', 'DD-MM-YYYY HH24:MI:SS')
AND 5MillTbl.checkout_TIME <TO_DATE ('12-31-2010 00:00:00', 'DD-MM-YYYY HH24:MI:SS')
AND ( 5MillTbl.col2 IS NULL
OR NOT (5MillTbl.col2 = 5
OR 5MillTbl.col2 = 6)
AND 5MillTbl.ID IS NOT NULL
AND 30millTbl.TYPE= '30'
AND my_DEP.addr_id = 61

Left join (+) instead of "not in"

Hi all!
I've got statement with "where dig not in (840, 978)" string.
How do I write statement without "not in" ?
I thought about left join and "is not null", but don't know exactly how to use it.
Any ideas?
Thanks ahead.

Here is my solution:
select d.* from
(select 111 as accountno, 840 as currencyid from dual
union all
select 222 as accountno, 978 as currencyid from dual
union all
select 333 as accountno, 826 as currencyid from dual ) d ,
(select 840 as dig from dual
union all
select 978 as dig from dual ) j
where d.currencyid = j.dig(+)
and j.dig is null
Thanks to all.

How to Left Join?

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