ALTER TABLE CONCEPTOSFAC ADD CON_CFE VARCHAR(20)
GO
ALTER TABLE REFERENCIAS ADD REF_CFE VARCHAR(20)
GO
CREATE TABLE PRODESTANDARES ( 
Id INT IDENTITY(1,1) NOT NULL,
Codigo VARCHAR(20) NOT NULL,
Descripcion VARCHAR(500) NOT NULL
 CONSTRAINT PK_ProdEstandares PRIMARY KEY NONCLUSTERED (Id),
 CONSTRAINT CK_ProdEstandaresCodigo CHECK ((len([Codigo]) > 0)),
 CONSTRAINT CK_ProdEstandaresDescripcion CHECK ((len([Descripcion]) > 0))
)
GO
CREATE UNIQUE CLUSTERED INDEX [IX_ProdEstandaresCodigo] ON [dbo].[ProdEstandares] ([Codigo])