Fetching data from three tables.

Hi All,
I am having three tables company(com_id(PK),com_name),
contact(contact_id(PK),com_id(FK),first_name,email),
location(loc_id(PK),com_id(FK),country).
I need a query to retrieve the first name,email,com_name and country.
I used:
select contact.first_name,contact.email,company.com_name,m.country from contact
LEFT JOIN location m ON contact.com_id=m.com_id
LEFT JOIN company c ON contact.com_id=c.com_id
but its returning duplicate rows.
I am new to this .Please tell me how to solve this problem.
thanks,

Jeeth wrote:
Hi
Thanks to all for the reply..
I am using Oracle 10g
Version:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - ProductionThat says you're uising Oracle 11 (11.2.0.1.0 to be precise), not 10.
... And the LOCATION Table containing:
COM_ID     ADDRESS_ID COUNTRY
28     1265     United States
28     1266     United States
381     381     United States
610     1873     United States
864     1586     United States
869     870     United States
2414     2662     United StatesPost CREATE TABLE and INSERT statments for your sample data.
It helps if you explain what the data means. For example, this problem seems to hinge on location.com_id not being unique. What does each row, and each column, in the location table represent? What does each row in the output represent?
Tried the Query:
select d.first_name, d.email ,c.com_name , m.country from company c,contact d,location m
where c.com_id=d.com_id and c.com_id=m.com_id
I got the result: The second row is repeating:
Alexander     [email protected]     JPMorgan Chase & Co. (KEY ACCOUNT)     United States
Alexander     [email protected]     ADP, Inc.      United States
Alexander     [email protected]     ADP, Inc.      United States
Alfred     [email protected]     Perficient Inc.     United States
Allan     [email protected]     Progressive Insurance     United States
Linda      [email protected]     Principal Financial Group, Inc.     United States
Alycia     [email protected]     Emerson Electric Co. (KEY ACCOUNT)     United States
Want output like:
Alexander     [email protected]     JPMorgan Chase & Co. (KEY ACCOUNT)     United States
Alexander     [email protected]     ADP, Inc.      United States
Alfred     [email protected]     Perficient Inc.     United States
Allan     [email protected]     Progressive Insurance     United States
Linda      [email protected]     Principal Financial Group, Inc.     United States
Alycia     [email protected]     Emerson Electric Co. (KEY ACCOUNT)     United States
Why do you want that ouptut, and not the output that you're originally getting?
What output would you want if the part you were displaying were different on each row. For example, if we add a row like this to the sample data:
COM_ID     ADDRESS_ID     COUNTRY
2414     2663          MexicoThee are many different reasons why you could want the output you do. Each one has a different solution, that would produce different results with different data. You need to explain what you want to do, then someone can help you find a way to code it.
The simplest way is to say SELECT DISTINCT . That happens to get the right results with the given sample data.

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