Excel中我們可以使用這個公式統計出各個價格所屬的價位段,然後再通過透視表得出數據結果:
=LOOKUP(H2,{0,49.99,99.99,149.99,199.99,249.99;”050″,”100″,”150″,”200″,”250″,”250+”})
MySQL中則可使用以下命令,一步到位:
SELECT price_range, count(*) AS number
FROM
(select case when Price >= 0 and Price <= 49.99 then '050'
when Price >= 50 and Price <= 99.99 then '100'
when Price >= 100 and Price <= 149.99 then '150'
when Price >= 150 and Price <= 199.99 then '200'
when Price >= 200 and Price <= 249.99 then '250'
else '250+'
end as price_range
FROM products
WHERE 1
) AS price_summaries
GROUP BY price_range
ORDER BY price_range;
為了方便排序,以上我們簡化了數字區間的命名,相當於是[0,50)、[50,100)、[100,150)、[150,200)、[200,250)、[250,)