SQL 对计数结果进行计数

Question

我正在尝试生成要在 Data Studio 中显示的销售报告。我有列 email、order_number 和 total_price，我正在尝试使用 sql 查询来识别以下内容：

1. 重复和新客户的数量（计算订单数量，如果订单 > 1 则重复，否则为新客户）
2. 回头客和新客户的订单数量

    Date     | email             | Order_number | Total Price 
---------------------------------------------------------------
    101019   | email1@email.com  | 1111         | 100         
    101019   | email2@email.com  | 1112         | 200        
    111019   | email3@email.com  | 1113         | 130         
    111019   | email1@email.com  | 1111         | 100  

我所做的只是统计每封邮件的订单数量

SELECT email, count(email) as order_count, date FROM orders GROUP BY 
email

这是我要展示的示例报告

    Repeating Customer | New Customer  
        1              |       2


    Orders from Repeating Cust. | Orders from New Customer
          2                     |    2


    Total Price Repeating Cust. | Total Price New Custo.
          200                   |      330

非常感谢任何帮助。

Answer 1

你可以试试 Case 和 Sub 查询：

SELECT SUM(CASE WHEN t.Cust_cnt=1 THEN 1 ELSE 0 END) AS New_Cust,
       SUM(CASE WHEN t.Cust_cnt>1 THEN 1 ELSE 0 END) AS Repeat_Cust,
       SUM(CASE WHEN t.Cust_cnt=1 THEN t.Total_Order ELSE 0 END) AS New_Cust_Order,
       SUM(CASE WHEN t.Cust_cnt>1 THEN t.Total_Order ELSE 0 END) AS Repeat_Cust_Order,
       SUM(CASE WHEN t.Cust_cnt=1 THEN t.Total_Price ELSE 0 END) AS New_Cust_Order_Total_Price,
       SUM(CASE WHEN t.Cust_cnt>1 THEN t.Total_Price ELSE 0 END) AS Repeat_Cust_OrderTotal_Price,
       t.Last_Order_Date
FROM (
SELECT COUNT(Email) AS Cust_cnt,SUM(O_Price) AS Total_Price,COUNT(O_Number) AS Total_Order, MAX(O_Date) AS Last_Order_Date, Email  FROM Orders Group by Email) AS t;

Answer 2

使用两个单独的查询，一个用于重复客户，一个用于新客户，然后只需加入他们即可创建您的报告。

回头客

SELECT email, COUNT(email), SUM(TotalPrice) as order_count FROM orders GROUP BY email HAVING COUNT(email) > 1

新客户

SELECT email, SUM(TotalPrice) as order_count FROM orders GROUP BY email HAVING COUNT(email) = 1

如果您使用前端技术来显示这些结果，您也可以在前端将这些结果编译为水平方向（两列而不是两行中的重复和新客户）。如果您想在纯 SQL 中执行此操作，只需 CROSS JOIN 两个查询即可获得输出。