Join and flatten table output - sql

Question

I am currently trying to join 3 tables. The main table is company, if there is 3 companies and 2 roles exists in the role table I want the output to be like this:
Company1, Role 1, <iduser>
Company1, Role 2, <iduser>
Company2, Role 1, <iduser>
Company2, Role 2, <iduser>
Company3, Role 1, <iduser>
Company3, Role 2, <iduser>
For each role there must be a row for a company. If no user is linked to a role and company then it should just show: Companyname, Rolename, null
Database schema:
CREATE TABLE [dbo].[role](
[idrole] [int] IDENTITY(1,1) NOT NULL,
[name] [nchar](100) NOT NULL,
CONSTRAINT [PK_role] PRIMARY KEY CLUSTERED
(
[idrole] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[company](
[idcompany] [int] IDENTITY(1,1) NOT NULL,
[name] [nchar](100) NOT NULL,
CONSTRAINT [PK_company] PRIMARY KEY CLUSTERED
(
[idcompany] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
CREATE TABLE [dbo].[user](
[iduser] [int] IDENTITY(1,1) NOT NULL,
[name] [nchar](100) NOT NULL,
[idcompany] [int] NOT NULL,
[idrole] [int] NULL,
CONSTRAINT [PK_user] PRIMARY KEY CLUSTERED
(
[iduser] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
ALTER TABLE [dbo].[user] WITH CHECK ADD CONSTRAINT [FK_user_company] FOREIGN KEY([idcompany])
REFERENCES [dbo].[company] ([idcompany])
GO
ALTER TABLE [dbo].[user] CHECK CONSTRAINT [FK_user_company]
GO
ALTER TABLE [dbo].[user] WITH CHECK ADD CONSTRAINT [FK_user_role] FOREIGN KEY([idrole])
REFERENCES [dbo].[role] ([idrole])
GO
ALTER TABLE [dbo].[user] CHECK CONSTRAINT [FK_user_role]
GO
Test data script:
INSERT INTO [test].[dbo].[company]
VALUES ('Company 1')
INSERT INTO [test].[dbo].[company]
VALUES ('Company 2')
INSERT INTO [test].[dbo].[company]
VALUES ('Company 3')
INSERT INTO [test].[dbo].[role]
VALUES ('Role 1')
INSERT INTO [test].[dbo].[role]
VALUES ('Role 2')
Attempt:
SELECT roles.name, users.iduser
FROM [test].[dbo].[role] roles
JOIN [test].[dbo].[user] users ON roles.idrole = users.idrole
JOIN [test].[dbo].[company] company ON company.idcompany = users.idcompany
Please advise what approach I can use to achieve this

Answer 1

Given you don't have a relationship between a Role and a Company, I assume you want every combination of Role/Company, which is where you use a CROSS JOIN.
Then you would LEFT JOIN your User table on since you want to return null if a user doesn't exist for a given Company-Role.
SELECT C.[name], R.[name], U.iduser
FROM [test].[dbo].[role] R
CROSS JOIN [test].[dbo].[company] C
LEFT JOIN [test].[dbo].[user] U ON U.idrole = R.idrole and U.idcompany = C.idcompany
ORDER BY C.[name], R.[name], U.iduser;
Note the use of shorter aliases for clarity.

Answer 2

I think we need to apply a cross join of the 2 tables the Company and Role tables, afterwards join with the users
select * from (
select idcompany, b.name as coname, a.name, a.idrole
from company b
cross join
(select idrole, name from role) a
) c
left join dbuser d on c.idcompany = d.idrole
order by c.coname, c.name