Theoretical Example: Order hasMany OrderItem, OrderItem belongsTo
Order, Item:

$this->OrderItem->find(
     'Order.date BETWEEN "' . date('Y-m-d') . '" AND "' . date('Y-m-d',
strtotime('-1 month')) . '"',
     'SUM(Item.price) As total'
);

If you wanted to calculate that including the tax per order, you could
easily drop in a sub-select.  We're looking at some more advanced ways
to build queries in Cake 1.2.


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