Declare @Id Int                               
Select @Id = Id From sysobjects Where Name = 'Kalaid'
if not Exists(SELECT * FROM syscolumns WHERE id = @Id and Name = 'TaxPercent')
  Alter Table Kalaid Add  TaxPercent REAL NOT NULL DEFAULT(0) 


Select @Id = Id From sysobjects Where Name = 'Kalaid'
if not Exists(SELECT * FROM syscolumns WHERE id = @Id and Name = 'DiscountPercent')
  Alter Table Kalaid Add  DiscountPercent REAL NOT NULL DEFAULT(0) 
