需要解決查詢

Question

EasyShop的管理人員希望將物品分類爲便宜，實惠，昂貴且非常昂貴。如果商品單價在0到499之間，則爲「廉價」，如果在500和1999之間則爲「經濟實惠」，如果在2000和4999之間則爲「昂貴」，並且如果價格大於或等於5000，那麼進行分類，昂貴'。編寫查詢以顯示項目的項目類型和分類。按升序顯示按項目類型和分類排序的唯一行。

這是我的查詢

SELECT DISTINCT ItemType, 
CASE 
Price BETWEEN 0 AND 499 THEN 'Cheap' 
Price BETWEEN 500 AND 1999 THEN 'Affordable' 
Price BETWEEN 2000 AND 4999 THEN 'Expensive' 
Price >=5000 THEN 'Very Expensive' 
END Classification 
FROM Item 

Answer 1

你們是不是有點像下面？檢查出來：

SELECT DISTINCT CASE 
WHEN Price BETWEEN 0 AND 240 THEN 'Cheap' 
WHEN Price BETWEEN 241 AND 1200 THEN 'Expensive' END AS Range 
FROM Products 
ORDER BY Price 

Answer 2

您需要由ItemType的，分類添加爲了在您的查詢。您還應該在CASE聲明中包含WHEN。

SELECT DISTINCT ItemType, 
CASE WHEN 
     Price BETWEEN 0 AND 499 THEN 'Cheap' 
     Price BETWEEN 500 AND 1999 THEN 'Affordable' 
     Price BETWEEN 2000 AND 4999 THEN 'Expensive' 
     Price >=5000 THEN 'Very Expensive' 
END Classification 
FROM Item 
ORDER BY ItemType, Classification