需要解决查询

Question

EasyShop的管理人员希望将物品分类为便宜，实惠，昂贵且非常昂贵。如果商品单价在0到499之间，则为“廉价”，如果在500和1999之间则为“经济实惠”，如果在2000和4999之间则为“昂贵”，并且如果价格大于或等于5000，那么进行分类，昂贵'。编写查询以显示项目的项目类型和分类。按升序显示按项目类型和分类排序的唯一行。

这是我的查询

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

你们是不是有点像下面？检查出来：

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，分类添加为了在您的查询。您还应该在CASE声明中包含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