grid.Ready(false);
grid.Reset();
grid.AddHiddenColumn("ID");
grid.AddColumn(t_("Check"),50).Option();
//some more columns... none a checkbox option
grid.AddColumn(t_("Num"),45).Edit(snum);
// SQL SELECT
if(SQL.WasError())
{
	//ERROR HANDLING
}
while(SQL.Fetch())
{
	// some calculation for num.... let's say random -100 to 100 to make it easier 
	bool ord = (num >= 0);
	grid.Add(SQL[ID], ord /*,..more columns..*/);
}
grid.Ready(true);
grid.EditCell();
grid.Sort(1,2,true,false);
//grid.Sort(6,2,true,true); //num from earlier

FOREACH_ROW(grid)
{
	if(grid(1) /*&& int(grid(6))>0*/) // checkbox ticked and num > 0
	{
		// writing to SQL, exporting to csv... 
		// nothing too interesting really
	}
}