-- recalculate CurRate in discipline table
update disciplines
inner join (
    select  modules.DisciplineID, SUM(submodules.MaxRate) as rate
    from submodules
    inner join modules on submodules.ModuleID = modules.ID
    where submodules.isUsed and (modules.Type = 'regular' or (modules.Type = 'exam' and modules.OrderNum = 1))
    group by modules.DisciplineID
) as t on disciplines.ID = t.DisciplineID
set disciplines.CurRate = t.rate;