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outer join help needed urgent.. [message #38562]

Fri, 26 April 2002 15:20

shreya
Messages: 15
Registered: March 2001

Junior Member

Hi,
Here is my quey.

DROP TABLE my_acc_table;
CREATE TABLE my_acc_table AS
SELECT a.*
FROM schma1.user_table@x1 a,
schma2.user_table@x2 b
WHERE
a.start_date = '01-jan-02'
and b.start_date = '01-jan-02'
and a.user_id = b.user_id
and ABS(a.amount-b.amount) /
DECODE(a.amount,0,1,a.amount) >= 0.05;

I have to write outer join for this query.
user_id's may be different in both the schema.

I need both the left and the right outer join for this query.
If anyone knows how to do it please send it.
I would be very thankful to u.

Regards,
Sushma.

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Re: outer join help needed urgent.. [message #38568 is a reply to message #38562]

Fri, 26 April 2002 20:46

Saga
Messages: 51
Registered: April 2002

Member

Lets first look at outer join implementation
Rule 1: Outer join(+) applies to side(column) which is deficient in data.
Rule 2: Outer join is applied to only one side in a given condition be it left side or right side.You can apply it to either left or right side in a condition but not to both.

example

and a = b(+)
and c(+) = d
is correct

But
and a(+) = b(+) --wrong
and c(+) = d
is not

Hope it will help.

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Re: outer join help needed urgent.. [message #38574 is a reply to message #38562]

Sat, 27 April 2002 21:21

Vikas Gupta
Messages: 115
Registered: February 2002

Senior Member

Hello,

Why don't you use the UNION clause.
First select statement with one outer join
union
second select statement with other outer join.

Regards,

Vikas Gupta.

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Re: outer join help needed urgent.. [message #38623 is a reply to message #38562]

Wed, 01 May 2002 06:52

oraboy
Messages: 97
Registered: October 2001

Member

Have a look at SQL new syntax available from 9i onwards. The messy and confusing (atleast for newbies) outer join operations (placing + this side or that side) are replaced by a simple syntax OUTER JOIN

select ..from table a LEFT OUTER JOIN table b

how abt that?

Oraboy

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