IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'People' AND  COLUMN_NAME = 'Pro_ID_VahedMali')
begin
alter table People add Pro_ID_VahedMali int references OtherProperties(ID) null
end
go
IF not EXISTS( SELECT * FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'kala' AND  COLUMN_NAME = 'Pro_ID_VahedMali')
begin
alter table kala add Pro_ID_VahedMali int references OtherProperties(ID) null
end