2多对多关系-通过联接提取数据

Question

Please check the schema in the link below.

http://s11.postimg.org/dydr5ru3n/stack.png

I want to select all properties and also the agent and the owner of each property. The problem is that both agent's and owner's details comes from the same table and there is a conflict.

What solution should i follow?

Note: Unfortunately I cannot change the db schema.

Answer 1

SELECT oPers.first_name AS ownerFirstName
    , aPers.first_name AS agentFirstName
    ....
FROM properties AS p
LEFT JOIN owners AS po ON p.property_id = po.property_id
LEFT JOIN people AS oPers ON po.person_id = oPers.person_id
LEFT JOIN agents AS pa ON p.property_id = pa.property_id
LEFT JOIN people AS aPers ON pa.person_id = aPers.person_id
;