Question

我想加入以前加入的以下2个表，以便我可以看到结果，它在同一个窗口中并排显示Active和Inactive Subscription。怎么样？

表1（订阅表）

CUSTOMER ID | NAME | StartDate |结束日期

表2（客户表）

CUSTID | ......（不自由）

这将为我提供活动嫌疑人数

Select      T1.CustomerID, T1.Name, COUNT(CustomerID) [# Active Subscription]
FROM        #Customer T1
INNER JOIN  #Subscription AS T2
ON          T1.CustomerID = T2.CustID
WHERE       (T2.EndDate >= CURRENT_TIMESTAMP)
GROUP BY    T1.CustomerID, T1.Name

这会给我一些非必要的嫌疑人

Select      T1.CustomerID, T1.Name, COUNT(CustomerID) [# Inactive Subscription]
FROM        #Customer T1
INNER JOIN  #Subscription AS T2
ON          T1.CustomerID = T2.CustID
WHERE       (T2.EndDate < CURRENT_TIMESTAMP)
GROUP BY    T1.CustomerID, T1.Name

〜＆gt;＆gt;希望查看CustomerID，名称，＃Active订户，＃Inactive Subscriber

〜＆gt;＆gt;既然他们在两个表中都有相同的CustomerID，那么我认为我们可以做另一个加入......但是不知道怎么写它。

Answer 1

您需要首先对派生表执行GROUP和JOIN，然后对输出执行CASE聚合

尝试这样的事情;

SELECT

CASE WHEN (T2.EndDate >= CURRENT_TIMESTAMP) THEN
T1.CustomerID END AS customer_id_active,
CASE WHEN (T2.EndDate >= CURRENT_TIMESTAMP) THEN
T1.Name END AS name_active,
CASE WHEN (T2.EndDate >= CURRENT_TIMESTAMP) THEN
COUNT(CustomerID) END AS count_customerID_active,

CASE WHEN (T2.EndDate < CURRENT_TIMESTAMP) THEN
T1.CustomerID END AS customer_id_inactive,
CASE WHEN (T2.EndDate < CURRENT_TIMESTAMP) THEN
T1.Name END AS name_inactive,
CASE WHEN (T2.EndDate < CURRENT_TIMESTAMP) THEN
COUNT(CustomerID) END AS count_customerID_inactive,

FROM
(SELECT * FROM #Customer AS T1 INNER JOIN #Subscription AS T2 GROUP BY T1.CustomerID, T1.Name) AS derived_table

加入2个加入的表

1 个答案: