IF NOT EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME = 'NR_PROTOCOLO' AND OBJECT_ID = OBJECT_ID('EST_NF_ENT_EST_PED_VD'))
	ALTER TABLE EST_NF_ENT_EST_PED_VD ADD NR_PROTOCOLO VARCHAR (50) COLLATE SQL_Latin1_General_CP1_CI_AS
