Question

我对SQL很陌生，我正在试图弄清楚如何得到这个结果：

Type                   Number Sold
Detached                    5
Semi-detached               2
Terrace                     1
Link                        8

使用查询，我尝试过：

  SELECT SPropertyType AS Type, COUNT (SPropertyCurrentState) AS NumberSold
  FROM SaleProperty
  WHERE SPropertyCurrentState = 'Sold';

但它给了我一个错误。

Answer 1

您忘了使用GROUP BY。使用此：

SELECT
    SPropertyType AS Type,
    COUNT (SPropertyCurrentState) AS NumberSold
FROM
    SaleProperty
WHERE
    Upper(SPropertyCurrentState) = 'SOLD'
GROUP BY
    SPropertyType;

Answer 2

您需要添加group by SPropertyType子句

最终的SQL将如下所示

 SELECT 
    SPropertyType AS Type, 
    COUNT (SPropertyCurrentState) AS NumberSold
  FROM SaleProperty
  WHERE 
    SPropertyCurrentState = 'Sold'
  GROUP BY 
    SPropertyType;

COUNT针对各自类型销售的物业数量？

2 个答案: