IF NOT EXISTS (SELECT 1 FROM SYSCOLUMNS WHERE ID = OBJECT_ID('EST_NF_SAI_DAR') AND name = 'UF_PERC')
begin
ALTER TABLE dbo.EST_NF_SAI_DAR ADD
	UF_PERC float(53) NOT NULL CONSTRAINT DF_EST_NF_SAI_DAR_UF_PERC DEFAULT 0
end