mysqlの3つのテーブル間の内部結合

select con.name as contact_name , com.name as company_name,campa.name as campaign_name
from contact con inner join company com
on con.companyid = com.companyid
inner join campaign campa
on com.campaignid = campa.campaignid

尊重されるテーブルのid列を想定