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RailsのActiverecordでGroup By句を使う

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where句 や order by句 を使いながらgroup by するサンプル

@order = Order.select('max(seq) as seq, max(price) as price')
@order = @order.where('price >= ?', 5000)
@order = @order.group('group1, group2')
@order = @order.order('max(price) desc')
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