if (select count(*) from sys.syscolumns where tname='SpaReservations' and cname='ServicePrice')=0 then

alter table SpaReservations
Add ServicePrice DECIMAL(12,4) default 0

end if

GO

if (select count(*) from sys.syscolumns where tname='SpaReservations' and cname='ServiceKodCurrency')=0 then

alter table SpaReservations
Add ServiceKodCurrency integer default 1

end if