IF NOT EXISTS (SELECT * FROM SYS.COLUMNS WHERE NAME = 'FLAG_NAO_ENVIA_GT' AND OBJECT_ID = OBJECT_ID('GLB_NT_OP'))
BEGIN
	ALTER TABLE GLB_NT_OP ADD FLAG_NAO_ENVIA_GT INT NOT NULL CONSTRAINT DF_GLB_NT_OP_FLAG_NAO_ENVIA_GT DEFAULT 0
END