select tbPlano.Plano , @suavariavel as mesano
from tbPlano
inner join tbVinculo on tbPlano.idPlano = tbVinculo.idPlano
inner join tbCliente on tbVinculo.idCliente = tbCliente.idCliente
where
(tbPlano.idPlano = @idPlano)
and
(tbVinculo.idCliente = @idCliente)