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@kayinja.denis,

...OR...you could create a view that does the work for you and all you would have to do is call the view.

Hello
thanks but that query is already in view.... I run it from it i didn't use either the model or controller to query the marks, rather view.
Maybe I've not understood you better, or please show me what u are trying to mean here.
otherwise i'll try to first consider @Pertti  solution.