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Let's learn about the simplest way to query the mysql join table. I believe you will benefit a lot after reading it. The text is not in the essence. I hope the simplest way to query the mysql join table is what you want.

1. Query 4 tables (query several fields of a, b, c, d tables, and then from is equivalent to giving the table name an alias, namely a, b, c, d. Then where is to set some conditions)

Select a.name,a.quota_mailbox,a.quota_netdisk,a.limit_send,a.limit_recv,b.realname,c.dept_id,c.position,d.title from core_mailbox a,co_user b,co_department_member c,co_department d where a.mailbox_id=b.mailbox_id and a.mailbox_id=c.mailbox_id and c.dept_id=d.id

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