MySQL獨特的項目數量查詢

Question

我有這個表上的MySQL。

CustomerName CustomerGroup hasPurchase 
Jerry  A    CAR 
Jerry  A    TOY 
Jerry  A    CAR 
Springer  B    DRINK 
Springer  B    CAR 
Springer  B    CAR 
Springer  B    DRINK 

我的預期結果：

CustomerName CustomerGroup totalPurchase uniquePurchase 
Jerry  A    3    2 
Springer  B    4    2 

totalPurchase是他買的全部項目。 uniquePurchase是他購買的不同類型的物品。

這是什麼是正確的MySQL查詢？ Thx尋求幫助。

Answer 1

SELECT DISTINCT CustomerName, 
       CustomerGroup, 
       COUNT(hasPurchase) as totalPurchase, 
       COUNT(DISTINCT hasPurchase) as uniquePurchase 
FROM XXX 
GROUP BY CustomerName, 
     CustomerGroup 

我沒有在MySQL運行它一起，但我認爲它應該工作。

Answer 2

假設客戶名稱和customerGroup是相同的每一行，使用count和count與distinct與group by

select customerName 
,customerGroup 
,count(hasPurchase) as totalPurchase 
,count(distinct hasPurchase) as uniquePurchase 
from your_table 
group by CustomerName,CustomerGroup 

Answer 3

您可以通過此

Count(hasPurchase)嘗試組taotalPurchase

Count(Distinct hasPurchase)爲uniquePurchase

SELECT customerName,customerGroup,count(hasPurchase) as totalPurchase,count(distinct hasPurchase) as uniquePurchase 
from table group by CustomerName;