DECLARE @Id AS BIGINT
Select @Id = Id From sysobjects Where Name = 'NoteBimeh'
if not Exists(SELECT * FROM syscolumns WHERE id = @Id and Name = 'BirthDate')
  Alter Table dbo.NoteBimeh Add BirthDate SMALLDATETIME

SELECT @Id = id FROM sysobjects WHERE name = 'Price_Sazman';
IF NOT EXISTS(SELECT *FROM syscolumns WHERE id = @Id  AND name = 'AgeLimit')
    ALTER TABLE Price_Sazman ADD AgeLimit SMALLINT NULL DEFAULT (0);
