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

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Does a hand come out of the screen, grabbing you by the wrist, every time you try?
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Hello,
i am making query where i encounter problem with left join in oracle. I am using oracle 10g and i prepare simple test case.
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t1.a
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from
t1, t2, t3
where
t1.a = t2.a (+)
and t2.b = t3.b (+)
and t3.b is null
order by t1.a
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BluShadow wrote:
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SQL>
SQL> select * from v$version
2 where rownum <= 1;
BANNER
Oracle Database 10g Express Edition Release 10.2.0.1.0 - Product
SQL>
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SQL>
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SQL> insert into t1 (a) values (2);
1 row created.
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1 row created.
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2       , t2.a, t2.b
3       , t3.b
4 from
5         t1 left outer join t2 on (t1.a = t2.a)
6            left outer join t3 on (t2.b = t3.b)
7 where t3.b is null
8 order by t1.a;
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2       , t2.a, t2.b
3 --     , t3.b
4 from
5         t1 left outer join t2 on (t1.a = t2.a)
6            left outer join t3 on (t2.b = t3.b)
7 where t3.b is null
8 order by t1.a;
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         2          2
         3
SQL>Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Help with outer joins in Oracle!!

so far this is what i've come up with and the code below does not work. Can anyone please help me on how the sytanx of left joins and how to use multiple left joins in a single query in oracle?
SELECT a.*, b.Position_CD, c.Skill_CD, d.Team_Name, d.Team_Country, d.Club, e.Structure_Name
FROM Roster a, Roster_position b, roster_skill c, Team d, Team_Structure e
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I dont' know how to add more left joins!
Here is the query I'm trying to duplicate (which is a query from Ms Access databaase which works fine).
SELECT a.*, b.Position_CD, c.Skill_CD, d.Team_Name, d.Team_Country, d.Club, e.Structure_Name
from ((Roster a LEFT JOIN (Roster_Position b LEFT JOIN Roster_Skill c ON b.Roster_ID=c.Roster_ID) ON a.Roster_ID=b.Roster_ID) LEFT JOIN Team d ON a.Team_CD=d.Team_CD) LEFT JOIN Team_Structure e ON a.Team_Structure_CD=e.Team_Structure_CD
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First,
I am not one of the leading SQL brains here...but I'm taking a stab, nonetheless.
Second,
Here's my best guess - and it seems to me that it should work as there are not two outer joins between any two tables. I hope I decoded your joins correctly - quite a mess that Access syntax!
SELECT a.*, b.position_cd, c.skill_cd, d.team_name, d.team_country, d.club, e.structure_name
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AND b.roster_id = c.roster_id(+)
AND a.team_cd = d.team_cd(+)
AND a.team_structure = e.team_structure(+);Third,
As an architect-dude, it seems to me that you have a serious
modeling problem to need so many outer joins in such a basic
grab of data. In any scale other than minute, the performance
of this model will suffer dramatically. Specifically, why can't
ROSTER have an equijoin with TEAM and with TEAM_STRUCTURE - as they
appear to be lookup tables...
Good Luck
(I'm certain you'll get better SQL from the others),
Michael O'Neill
Publisher of the PigiWiki
clever-idea.com

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Hi,
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Hi
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Hi,
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Rewrite as:
select a.id, b.id
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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,
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Left join dmlocation on fctclientcoverage.location_id = dmlocation.id
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group by client.id) MaxDates ON client.id = MaxDates.Id
where(fctclientcoverage.Ccoverrecordstopdate Is Null)
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Yes, You are correct!
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thanks

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Hi, all,
I want to query a db like these:
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"CLIN_FATIGUE" VARCHAR2(20) ,
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"CLIN_FEVER" VARCHAR2(20) ,
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"CLIN_CARDIOMEGALY" VARCHAR2(20) ,
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Thank very much!
Qian

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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.

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Hi,
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Regards,
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user10675696 wrote:
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Hi,
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Wilson

hi,
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regards Michael

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