issue selecting from many-to-many

Question

my db is very simple:

CREATE TABLE Account (
    accountId int NOT NULL AUTO_INCREMENT,
    name varchar(255) NOT NULL,
    PRIMARY KEY (accountId)
);

CREATE TABLE Manager (
    managerId int NOT NULL AUTO_INCREMENT,
    name varchar(255) NOT NULL,
    PRIMARY KEY (managerId)
);

CREATE TABLE ManagerAccount(
    id int not null auto_increment,
    managerId int not null,
    accountId int not null,
    primary key(id),
    foreign key(managerid) references Manager (ManagerID),
    foreign key(accountId) references Account (AccountID)
);

Now, when i return an account object to the user I need to pull all the account associated with specific account

So I did something like:

select m.name
from manager m
inner join ManagerAccount ma on m.managerId = ma.id
inner join Account a on ma.id = a.accountId
where a.accountId = 1;

but this does not give me the answer I want, I only get one manager name and there are 3 managers associated with accountId 1...

you can see here:

Answer 1

inner join ManagerAccount ma on m.managerId = ma.id
inner join Account a on ma.id = a.accountId

should be

inner join ManagerAccount ma on m.managerId = ma.managerId
inner join Account a on ma.accountId = a.accountId

Answer 2

In your query, you have an foreign key relationship of ManagerAccount.accountId with Account (AccountID). But you have mapped the primary key of ManagerAccount table with Account (AccountID).

SELECT 
    m.name
FROM
    Manager m
        INNER JOIN
    ManagerAccount ma ON m.managerId = ma.managerId
        INNER JOIN
    Account a ON ma.accountId = a.accountId
WHERE
    a.accountId = 1;