CREATE TABLE DocumentOwner
(
	CompanyID INT NOT NULL,
	OwnerID INT NOT NULL, 
	Description nvarchar(100),
	PRIMARY KEY (CompanyID, OwnerID)
);
CREATE TABLE Document 
(
	CompanyID INT NOT NULL,
	DocID INT NOT NULL, 
	DocOwnerID INT NOT NULL,
	Description nvarchar(100), 
	PRIMARY KEY (CompanyID, DocID)
);