IF NOT EXISTS (SELECT 1 FROM SYS.COLUMNS WHERE NAME = 'PROTOCOLO_MERCK' AND OBJECT_ID = OBJECT_ID('TELE_ORC') )
BEGIN
	ALTER TABLE TELE_ORC ADD PROTOCOLO_MERCK VARCHAR(20) COLLATE SQL_LATIN1_GENERAL_CP1_CI_AS CONSTRAINT DF_TELE_ORC_PROTOCOLO_MERCK DEFAULT NULL;
END;
 