Need clarification on ANSI Joins

Question

Hi All,
I need some clarification on the ANSI Join which I build to avoid an error when I am trying to execute the same in regular join.
With Regular join I am getting the error ORA-01417: a table may be outer joined to at most one other table.
Regular Join Condition:
select null
FROM
land_event_device_fraud T1, --Update Dealer
land_event_device_upgrade T2, --New Subscriber First Set
syn_intg_event_device_state T3, --Existing Subscriber
land_event_device_upgrade T4 --New Subscriber Second Set       
WHERE T1.event_id = T2.event_id(+) AND T1.rate_plan_id = T2.rate_plan_id(+)
AND T1.event_id = T3.event_id(+) AND T1.rate_plan_id = T3.rate_plan_id(+)
AND T4.event_id = T1.event_id(+) AND T4.event_id = T1.rate_plan_id(+)
AND T4.event_id = T3.event_id(+) AND T4.event_id = T3.rate_plan_id(+);
--Getting error ORA-01417.
Replaced the above join with ANSI Join
SELECT NULL
FROM land_event_device_fraud t1
LEFT OUTER JOIN land_event_device_upgrade t2
ON (t1.event_id = t2.event_id AND t1.rate_plan_id = t2.rate_plan_id)
LEFT OUTER JOIN syn_intg_event_device_state t3
ON (t1.event_id = t3.event_id AND t1.rate_plan_id = t3.rate_plan_id),
land_event_device_upgrade t4
LEFT OUTER JOIN land_event_device_fraud t5
ON (t4.event_id = t5.event_id AND t4.rate_plan_id = t5.rate_plan_id)
LEFT OUTER JOIN syn_intg_event_device_state t6
ON (t4.event_id = t6.event_id AND t4.rate_plan_id = t6.rate_plan_id);
I want to know whether the ANSI Join is goig to work fine or it is going to give me any cartesian production information.
Appreciate your help here.
Thanks,
MK.

Answer 1

Hi,
Maddy wrote:
Hi All,
I need some clarification on the ANSI Join which I build to avoid an error when I am trying to execute the same in regular join.
With Regular join I am getting the error ORA-01417: a table may be outer joined to at most one other table.
Regular Join Condition:
select null
FROM
land_event_device_fraud T1, --Update Dealer
land_event_device_upgrade T2, --New Subscriber First Set
syn_intg_event_device_state T3, --Existing Subscriber
land_event_device_upgrade T4 --New Subscriber Second Set       
WHERE T1.event_id = T2.event_id(+) AND T1.rate_plan_id = T2.rate_plan_id(+)
AND T1.event_id = T3.event_id(+) AND T1.rate_plan_id = T3.rate_plan_id(+)
AND T4.event_id = T1.event_id(+) AND T4.event_id = T1.rate_plan_id(+)
AND T4.event_id = T3.event_id(+) AND T4.event_id = T3.rate_plan_id(+);
--Getting error ORA-01417.
Replaced the above join with ANSI Join
SELECT NULL
FROM land_event_device_fraud t1
LEFT OUTER JOIN land_event_device_upgrade t2
ON (t1.event_id = t2.event_id AND t1.rate_plan_id = t2.rate_plan_id)
LEFT OUTER JOIN syn_intg_event_device_state t3
ON (t1.event_id = t3.event_id AND t1.rate_plan_id = t3.rate_plan_id),
land_event_device_upgrade t4
LEFT OUTER JOIN land_event_device_fraud t5
ON (t4.event_id = t5.event_id AND t4.rate_plan_id = t5.rate_plan_id)
LEFT OUTER JOIN syn_intg_event_device_state t6
ON (t4.event_id = t6.event_id AND t4.rate_plan_id = t6.rate_plan_id);You're mixing ANSI joins and old joins. That's very confusing. Use all of one kind or all of the other.
>
I want to know whether the ANSI Join is goig to work fine or it is going to give me any cartesian production information.What happens when you try it? Does it produce the results you want?
Whenever you have a question, post a little sample data (CREATE TABLE and INSERT statements) and the results you want from that data. Explain how you get those results from that data.
Always say which version of oracle you're using.
See the forum FAQ {message:id=9360002}
Why does the SELECT clause include only NULL? Is this going to be used as an EXISTS sub-query? If so, why bother to do outer joins, and why do you care if it does a Cartesian product? What is the compete query?
For debugging purposes, you might want to include something that you can see in the SELECT clause.