“PostgreSQL Pilih Top 1 dari masing -masing grup” Kode Jawaban

PostgreSQL Pilih Top 1 dari masing -masing grup

SELECT rank_filter.* FROM (
        SELECT items.*, 
        rank() OVER (
            PARTITION BY color
            ORDER BY created_at DESC
        )
        FROM items
        WHERE items.cost < 50
    ) rank_filter WHERE RANK = 1