單組功能 - 按類別和地區劃分的產品數量

Question

我在線查看並找不到以下問題的答案。

我想創建下表。我可以創建除Count_product_A和count_product_B之外的所有列。

鏈接表：

鏈接表1：

Select 
    Region_flag, type, count(total product) 
    ,sum(Case when product in ('A') then count(total product) END) as count_product_A 
    ,sum(Case when product in ('B') then count(total product) END) as count_product_B 
FROM Table1 
Group by 
    Region_flag, type 

Answer 1

嘗試此查詢：

SELECT 
    region_flag, type, 
    count(1) AS count_total, 
    sum(CASE WHEN product IN ('A') THEN 1 ELSE 0 END) AS count_product_A, 
    sum(CASE WHEN product IN ('B') THEN 1 ELSE 0 END) AS count_product_B 
FROM 
    table1 
GROUP BY 
    region_flag, type