Home/ Questions/Q 8306849
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-08T18:24:42+00:00

I got 4 tables, Email_Company_Contact_Ref table is the table which linked with Email, Company,

  • 0

I got 4 tables, Email_Company_Contact_Ref table is the table which linked with Email, Company, and Contact.

**Email_Company_Contact_Ref**

id = primary key
email_id = reference to Email.`id`
ref_id = it can be Company.id / Contact.id
table = reference from which table name

table structure

I try to use left join to get my output, but I got duplicated result. If I try inner join, I will not get any result at all, it is because Company and Contact this two tables does not have any thing common.

This is the output I would like to complete.

output result

I able to use UNION to get the output, but it not really effective. I am thinking it should be a way to get the output result.. Please help.

Thanks!

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Here is my mysql answer, hope this can help

    SELECT e.email, r.table, c1.name AS company_name, c2.name AS contact_name
FROM email_company_contact_ref r
JOIN email e ON e.id = r.email_id
LEFT JOIN company c1 ON (c1.id = r.ref_id AND r.table = 'company')
LEFT JOIN contact c2 ON (c2.id = r.ref_id AND r.table = 'contact')
GROUP BY r.table, e.email
    • 0