MySQL从两个不同的表中查找重复项

Question

I have one contacts table with following fields :

id,
first_name,
last_name,

Also one more email_contacts table with following fields:

id,
email_address_id,
bean_id,

bean_id is the unique id from contacts table and email_address_id is unique id from other third email table .

I want to find duplicates from contacts table along with their respective emails.

Answer 1

Perhaps I'm not seeing the whole problem, but it would appear that contacts.id is a primary key, and email_contacts.bean_id is a foreign key.

If that's the case, then SELECT contacts.first_name , contacts.last_name , and email_contacts.email_id with a JOIN on contacts.id = email_contacts.bean_id .

Let me know if this answer is in the right direction, and then we can address the question of duplicate records.