How to get only matching rows in Full Outer Join

HI All,
I was recently asked this question.
How to fetch only matching data from two tables using Full Outer Join. Now, I understand that this is not the objective of using Full Joins but I was wondering whether this is possible or not.
Any help in this regard will be highly appreciated.

Full outer join returns both matching and not matching rows, if you want only matching rows why you don't use INNER JOIN?
The following query does an INNER JOIN using a FULL JOIN which I think it doesn't make any sense.
SELECT *
FROM
A FULL OUTER JOIN B
ON A.ColumnName = B.ColumnName
WHERE
A.ColumnName IS NOT NULL
AND B.ColumnName IS NOT NULL
EntityLite: A Lightweight, Database First, Micro ORM

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Unable to collapse rows after full outer joining several tables

All -
I often do a "full outer join" on numerous tables when I want to report all of the
contents of all of the tables in one relatively easy to inspect set of output. However,
now that my "leading" table is missing certain values, my output is definitely not
what I want.
Here's a test case:
drop table test11;
create table test11 (x number);
insert into test11 values (1);
insert into test11 values (3);
drop table test12;
create table test12 (x number);
insert into test12 values (2);
insert into test12 values (3);
drop table test13;
create table test13 (x number);
insert into test13 values (1);
insert into test13 values (2);
drop table test14;
create table test14 (x number);
insert into test14 values (2);
commit;
select test11.x t11,
test12.x t12,
test13.x t13,
test14.x t14
from (((test11 full outer join test12 on test11.x = test12.x)
full outer join test13 on test11.x = test13.x)
full outer join test14 on test11.x = test14.x);
And here is the output:
T11 T12 T13 T14
1 1
3 3
2
2
2
5 rows selected.
Forgive me if this doesn't appear with a fixed-width font. I
don't know how to format these postings.
See rows 3, 4, and 5? My desire is to jam those
together so that my output is this instead:
T11 T12 T13 T14
1 1
3 3
2 2 2
3 rows selected.
Do you have any idea how to do this? Of course, I'll need to
apply the solution to the general case so that all
test cases similar to this are fixed!
Thanks very much for your time!
Tom G.

For anyone who's interested -
Here is the solution I was able to put together on my own:
select max(t11) t11, max(t12) t12, max(t13) t13, max(t14) t14 from
select coalesce(test11.x, test12.x, test13.x, test14.x) ct,
       test11.x    t11,
       test12.x    t12,
       test13.x    t13,
       test14.x    t14
from (((test11 full outer join test12 on test11.x = test12.x)
                full outer join test13 on test11.x = test13.x)
                full outer join test14 on test11.x = test14.x))
group by ct;And the output:
       T11        T12        T13        T14
                    2          2          2
         1                     1
         3          3
3 rows selected.Bye,
Tom G.

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Hi, everyone.
If I want to get only 20 words from a table,
how can I write query?
For example,
Table name: WORD (this table is like dictionary)
columns: W_WORD, W_MEANING
Select * FROM WORD
WHERE W_WORD LIKE 'H%'
ORDER BY W_WORD ASC
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But, I want to get only 20 results(rows).
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You seem to be using SQLserver.
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How to get only new rows

hello,
I have a table like below
id_emp (int)
id_est (int)
dt_est(date)
for each id_emp I can have multiple id_est with multiple dt_est... like below
id_emp id_est dt_est
1 1 2009-01-10
1 2 2009-01-13
2 3 2009-01-10
2 4 2009-01-12
2 5 2009-01-14
3 6 2009-01-12
4 7 2009-01-15
5 8 2009-01-17
5 9 2009-01-19
I would like to get just the new rows based on date for each id_emp, so my result should be like below
id_emp id_est dt_est
1 2 2009-01-13
2 5 2009-01-14
3 6 2009-01-12
4 7 2009-01-15
5 9 2009-01-19
How could I do that?
Thanks

Hi,
Try this one :
SELECT id_emp,
max(id_est) keep (dense_rank last order by dt_est) id_est,
max(dt_est) dt_est
FROM <your_table_here>
GROUP BY id_emp;

Get only the rows where there are no matches in the tables

To include in the results of a join with no matching rows, you can use a full outer join. In MS SQL Server provides the FULL OUTER JOIN operator, which allows you to include all rows from both tables, regardless of the presence or absence of values.
You can add a WHERE clause in a FULL OUTER JOIN to get only the rows where there are no matches in the tables. The following query returns only those products for which there are no matches in the sales order.
SELECT p1.Name, p2.SalesOrderID
FROM TAB1 p1
FULL OUTER JOIN TAB2 p2
ON p1.ProductID = p2.ProductID
WHERE p1.ProductID IS NULL
ORDER BY p.Name ;
FULL OUTER JOIN is not supported in ABAP. How can you solve this?
Thanks in advance,
Serena

Similar problems can often be solved by using subqueries, please have a look here and try applying it.
http://help.sap.com/abapdocu_702/en/abenwhere_logexp_subquery.htm
Thomas

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Edited by: Julius Bussche on Jan 30, 2009 1:10 PM
Removed friendly greeting from the subject title

Hi Avik
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IF sy-subrc = 0.
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ELSE.
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ENDIF.
ENDMODULE.                 " PASSDATA OUTPUT
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Message was edited by: Nibu Wilson

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v_result := p_response.doc.extract('//'||p_name||'/child::text()').getstringval();
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1. Use Javascript E4X instead ...there are nice functions for getting children of parents.
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Fact vertical capabilities - Full outer Join - How to?

Hi,
I have the same problem described in another post: Forcing full outer join between two facts according to common dimensions
I will use the same example:
Let's assume 2 fact tables F1 and F2 and 2 dimension D1 and D2.
Fi is joined to Dj thanks to IDs.
F1 and F2 have got aggregates sum(mes1), respectively sum(mes2).
The group by is performed on dim1 for D1 and dim2 for D2.
The following 2 queries work fine...but separately:
select dim1, dim2, sum(mes1) from F1, D1, D2 where ... group by dim1, dim2; //7 lines
select dim1, dim2, sum(mes2) from F2, D1, D2 where ... group by dim1, dim2; //8 lines
When I try to select dim1, dim2, sum(mes1) and sum(mes2), the following sql is created by the BI server:
WITH SAWITH0 AS (
select dim1, dim2, sum(mes1) c3 from F1, D1, D2 where ... group by dim1, dim2
), SAWITH1 AS (
select dim1, dim2, sum(mes2) c3 from F2, D1, D2 where ... group by dim1, dim2
select ... dim1,
... dim2,
... SAWITH0.c3,
... SAWITH1.c3
FROM SAWITH0 LEFT OUTER JOIN SAWITH1
on SAWITH0.dim1=SAWITH1.dim1 and SAWITH0.dim2=SAWITH1.dim2
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The reply was a link to fact vertical capabilities of OBIEE
(http://gerardnico.com/wiki/dat/obiee/logical_sql/obiee_full_outer_join)
(http://gerardnico.com/wiki/dat/obiee/bi_server/design/obiee_densification_design_preservation_dimension)
In this post the solution is to add a dummy fact table to force a crossjoin.
This solution don't work in my case because I don't need to return all the members of the dimension, I just need to return the dimension member that are joined to both facts..
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I found what was the real problem:
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Any Idea?
Thanks

Ora-22905:cannot access rows from a non-nested ...(during full outer join)

Greetings Gurus,
I'm getting an ORA-22905 when I try and do a full outer join in the following function. If I include the commented lines in the perstren_diff_recs2 function I get the error. Both halfs of the union query work by themselves. When I union them bam error. Also, when I use the full outer join syntax the Oracle session craps the bed with a end of file communication error. That is why I'm using the simulated full outer join.
My goal was to abstract the XML in my queries. The results from the pipelined function is a delta between what is in the XML document and a relational base table.
Derrick
CREATE OR REPLACE PACKAGE XML_UTILS is
TYPE perstren_typ is record (
uic varchar2(6),
tpers varchar2(2),
deply varchar2(6),
secur varchar2(1),
struc number(4),
auth number(4)
TYPE perstren_diff_typ is record (
uic           varchar2(6),
transaction_type char(1),
tpers           varchar2(2),
deply           varchar2(6),
secur           varchar2(1),
struc           number(4),
auth           number(4)
TYPE perstrenSet is table of perstren_typ;
TYPE perstrenDiffSet is table of perstren_diff_typ;
function perstren_recs (uic varchar2) return perstrenSet pipelined;
function perstren_diff_recs2 (uic varchar2) return perstrenDiffSet pipelined;
end;
CREATE OR REPLACE PACKAGE BODY XML_UTILS is
function perstren_diff_recs2 (uic varchar2) return perstrenDiffSet pipelined is
cursor perstren_recs_cur(in_uic varchar2) is
select p.uic, p.tpers, p.deply, P.secur, p.struc,p.auth,
doc.uic as xmluic,
doc.tpers as xmltpers,
doc.deply as xmldeply,
doc.secur as xmlsecur,
doc.struc as xmlstruc,
doc.auth as xmlauth
from perstren_bac p left outer join
table(xml_utils.perstren_recs(in_uic)) doc
on (p.uic = doc.uic and
p.tpers = doc.tpers and
p.deply = doc.deply)
where p.uic = in_uic;
-- union
-- select p.uic, p.tpers, p.deply, P.secur, p.struc,p.auth,
-- doc.uic as xmluic,
-- doc.tpers as xmltpers,
-- doc.deply as xmldeply,
-- doc.secur as xmlsecur,
-- doc.struc as xmlstruc,
-- doc.auth as xmlauth
-- from perstren_bac p right outer join
-- table(xml_utils.perstren_recs(in_uic)) doc
-- on (p.uic = doc.uic and
-- p.tpers = doc.tpers and
-- p.deply = doc.deply)
-- where doc.uic = in_uic;
out_rec perstren_diff_typ;
begin
for cur_rec in perstren_recs_cur(uic) loop
if cur_rec.xmldeply is not null and cur_rec.xmltpers is not null then
out_rec.uic := cur_rec.xmluic;
out_rec.tpers := cur_rec.xmltpers;
out_rec.deply := cur_rec.xmldeply;
out_rec.secur := cur_rec.xmlsecur;
out_rec.struc := cur_rec.xmlstruc;
out_rec.auth := cur_rec.xmlauth;
else
out_rec.uic := cur_rec.uic;
out_rec.tpers := cur_rec.tpers;
out_rec.deply := cur_rec.deply;
out_rec.secur := cur_rec.secur;
out_rec.struc := cur_rec.struc;
out_rec.auth := cur_rec.auth;
end if;
if cur_rec.uic is not null and cur_rec.xmldeply is not null and cur_rec.xmltpers is not null and (
nvl(cur_rec.secur,'XX') != nvl(cur_rec.xmlsecur,'XX') or
nvl(cur_rec.struc,9999) != nvl(cur_rec.xmlstruc,9999) or
nvl(cur_rec.auth,9999) != nvl(cur_rec.xmlauth,9999)) then
out_rec.transaction_type :='U';
elsif cur_rec.uic is null and cur_rec.xmldeply is not null then
out_rec.transaction_type :='I';
elsif cur_rec.uic is not null and cur_rec.xmldeply is null then
out_rec.transaction_type :='D';
else
out_rec.transaction_type :='O';
end if;
PIPE row (out_rec);
end loop;
exception
when others then
if perstren_recs_cur%isopen then
close perstren_recs_cur;
end if;
raise;
return;
end;
function perstren_recs (uic varchar2) return perstrenSet pipelined is
cursor perstren_recs_cur(in_uic varchar2) is
select uic,
extractvalue(Column_value,'/PERSTREN/TPERS') as TPERS,
extractvalue(Column_value,'/PERSTREN/DEPLY') as DEPLY,
extractvalue(Column_value,'/PERSTREN/SECUR') as SECUR,
extractvalue(Column_value,'/PERSTREN/STRUC') as STRUC,
extractvalue(Column_value,'/PERSTREN/AUTH') as AUTH
from test_ref ref,
table(XMLSequence(extract(ref.XML_DOC,'/RasDataSet/PerstrenList/PERSTREN'))) per
where ref.uic = in_uic;
out_rec perstren_typ;
begin
open perstren_recs_cur(uic);
loop
fetch perstren_recs_cur into out_rec;
exit when not perstren_recs_cur%FOUND;
PIPE row (out_rec);
end loop;
close perstren_recs_cur;
exception
when others then
if perstren_recs_cur%isopen then
close perstren_recs_cur;
end if;
raise;
return;
end;
end;

Oracle bug when executing the query in a function

How can I join/Full outer join two different columns instead of union all?

Hi,
I have a scenario as the following:
I am performing set operations using obiee 11g where I want to take values from two different criteria. Howwver, I dont want union to take place, instead i want join to take place to see all the columns in the output.
For that, I tried changing the sql in advanced tab and tried to put full outer join instead of union all but its not allowing me to change.
How can I achieve it? please help.
Thanks.

Hi,
My problem is that I am unable to modify the sql in advanced tab. Probably due to some security reason,it's restricting me to change.
Can you suggest me a way to change it?
Thanks..

How to get only matching rows in Full Outer Join

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