if not exists (select * FROM INFORMATION_SCHEMA.COLUMNS where Table_Name='ort_reporteTecnico'  and column_name = 'id_canalAtencion' )
begin  
alter table [ort_reporteTecnico] add [id_canalAtencion] int NULL DEFAULT 0  FOREIGN KEY (id_canalAtencion) REFERENCES ort_canalAtencion(id)
end