Performance when OUTER JOINS are used

Hello Everyone,
I have read in asktom.com about the performance of an SQL query when OUTER JOINS are used. I am not able to find the same artical and would like any of you guys to clarify if the sql that I have written would be better or not.
1. I haven't used OUTER JOINS in an SQL query. The query used 3-4 tables.
In those 3-4 tables one table is transaction table (big one) and the other are tables like transaction_type.
2. The transactions tables thas the typ_code and the typ_desc is present in transaction_type. It is one(transaction_type) to many(transactions) relationship
3. And also as all the typ_code of transactions tables has definte value in transaction_types table, I thought of not usng OUTER JOINS.
Would you guys agree with me?

I have read in asktom.com about the performance of an
SQL query when OUTER JOINS are used. I am not able to
find the same artical and would like any of you guys
to clarify if the sql that I have written would be
better or not.The first thing to consider using outer joins or not - is whether the required business functionality needs them or not? Performance should be only the second thing because getting invalid results VERY FAST doesn't make any sense :)
Gints Plivna
http://www.gplivna.eu

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Problems performing an outer join

I added some criteria to the following sql statement to get the relationship.
ie ('Husband', 'Wife','Father','Mother','Step Mother','Step Father','Father in-law','Mother in-law')
The problem is that I also want to beable to display those that are not in this category. So I thought that I could do and outer join such as
and hcr.relationship_name(+) in ('Husband',
'Wife',
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thanks
select      hac.case_id,hac.relation_to_hoh_id,hcr.RELATIONSHIP_NAME,
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from      dpss_hts.hts_applicant ha,
          dpss_hts.hts_applicant_case hac,
          dpss_hts.certa_relationship hcr
where      ha.applicant_id = hac.applicant_id
and      round((trunc(sYSdate) - ha.DATE_OF_BIRTH) / 365,0) > 17
and      hac.relation_to_hoh_id = hcr.RELATIONSHIP_ID
and hcr.relationship_name in ('Husband',
'Wife',
'Father',
'Mother',
'Step Mother',
'Step Father',
'Father in-law',
'Mother in-law')

If I understand correctly, you want to display the relationship_name only if it is one of those in the list. If it is not, then you want to display the rest of the data, but not the realtionship_name.
Two approaches spring to mind. You can use an in-line view to select only the relationship_names you are interested in, then outer join to that in-line view like:
SELECT hac.case_id, hac.relation_to_hoh_id, hcr.relationship_name,
       DECODE(ha.gender_id, 1, '(F)', 2, '(M)', 3, '(T)')||' Adult '||
       ROUND((TRUNC(sysdate) - ha.date_of_birth) / 365, 0) info, 0 sort_by
FROM dpss_hts.hts_applicant ha, dpss_hts.hts_applicant_case hac,
     SELECT relationship_id, relationship_name
     FROM dpss_hts.certa_relationship
     WHERE hcr.relationship_name in ('Husband', 'Wife', 'Father', 'Mother',
                                     'Step Mother', 'Step Father',
                                     'Father in-law', 'Mother in-law') hcr
WHERE ha.applicant_id = hac.applicant_id and
      ROUND((TRUNC(sysdate) - ha.date_of_birth) / 365, 0) > 17 and
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Something like:
SELECT hac.case_id, hac.relation_to_hoh_id,
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FROM dpss_hts.hts_applicant ha, dpss_hts.hts_applicant_case hac,
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WHERE ha.applicant_id = hac.applicant_id and
      ROUND((TRUNC(sysdate) - ha.date_of_birth) / 365, 0) > 17 and
      hac.relation_to_hoh_id = hcr.relationship_idHTH
John

Toplink outer join issue using ExpressionBuilder getAlllowingNull

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Thanks for any help,
Lucian

Hello,
Calling builder.getAllowingNull("name_of_field_in_MyJDO"); returns an expression that is not used anywhere in the following code, and so it is not used in the query.
The addJoinedAttribute(String) on ReadAllQuery will make a simple join expression using the String as the query key. If you want to use an outerJoin instead of the simple inner join created, try:
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Best Regards,
Chris

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Question:
Will my “preferences” in photoshop set to a very high ram allowance affect crashes in the program? What other preferences settings might be causing a problem.
I can talk to Dell tech support if need be as this PC is only 4 months old.
Thanks for ongoing help,
Peter1269

Alternative for OUTER Join for use in fast refresh materialized view

Hi ,
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COL1 NUMBER
CREATE TABLE TEST_SANDY2
COL1 NUMBER,
COL2 VARCHAR2(10 BYTE)
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INSERT INTO TEST_SANDY1 ( COL1 ) VALUES (
1);
INSERT INTO TEST_SANDY1 ( COL1 ) VALUES (
2);
INSERT INTO TEST_SANDY1 ( COL1 ) VALUES (
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2, 'b');
INSERT INTO TEST_SANDY2 ( COL1, COL2 ) VALUES (
4, 'd');
COMMIT;
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select
b.col1
from
test_sandy1 a,
test_sandy2 b
where
b.COL1 = a.COL1(+)
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COL1
1
2
4
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Can someone suggest an alternate select to create fast refresh materialized view.
Thanks,
Sandipan

The select statement was not fitting my problem , so I'll change it as :
select
a.col1, nvl(b.col2, 'DEFAULT')
from
test_sandy1 a,
test_sandy2 b
where
b.COL1(+) = a.COL1
I get :
COL1     VAL
1     a
2     b
3     DEFAULT
How do I this ?

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Performance for outer join

Hello expert,
following statement is left outer join or right outer join? and comparing with statement " from PCM RIGHT OUTER JOIN R ON PCM.practice_state_code = R.practice_state_code ", whose performance is better? Appreciate very much.
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Hi,
843178 wrote:
Hello expert,
following statement is left outer join or right outer join?
PCM.practice_state_code (+) = R.practice_state_codeNeither. It's the old outer join notation. Using that syntax, the order in which you put the tables in the FROM clause doesn't matter.
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Performance when OUTER JOINS are used

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