Question

I have a user system where user accounts can own subordinate accounts.

To express this relationship I have the following mysql tables:

TABLE ACCOUNTS
ID
name

TABLE OWNEDACCOUNTS
accountID -> ACCOUNTS(ID)
ownerID -> ACCOUNTS(ID)

Though it isn’t obvious from these tables, this relationship can only go 2 levels deep:

Account -> Sub-Account -> Sub-Sub-Account

Currently I am able to SELECT all of the sub-accounts that belong to a top level account with the following:

SELECT  a.ID
FROM    accounts AS a
JOIN    ownedAccounts AS o
ON      o.accountID = a.ID
        AND o.ownerID = ?

However, what I’d really like is to SELECT all of the sub-accounts AND all of the sub-sub accounts that belong to a single top level account. How do I do this?

Thanks (in advance) for your help

Answer 1

Select ...
From accounts AS a
    Join ownedAccounts AS o
        On o.accountID = a.ID
    Join accounts AS owner1
        On owner1.ID = o.ownerID
    Left Join ownedAccounts AS o2
        On o2.accountID = owner1.ID
    Left Join accounts As owner2
        On owner2.ID = o2.ownerID
Where o.ownerID = ?