如何使用 Case When 語句對計數列進行計數

Question

SELECT DISTINCT f.location_name, COUNT (*) AS COUNT
FROM fastfood
GROUP BY f.location_name;

嗨，我想要做的是計算計數列，所以我可以具體看到有多少位置計數為 1，有多少位置計數為 2，等等。有人可以幫忙嗎？ 謝謝！

Answer 1

SELECT counter,count(*) how_many FROM (
  SELECT location_name, COUNT(*) AS COUNTER
  FROM fastfood 
  GROUP BY location_name
) a GROUP BY counter