MySQL唯一項目數查詢

Question

我在mysql上有此表。

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是他購買的總物品。 uniquePurchase是他購買的其他商品。

什么是正確的mysql查詢呢？ 謝謝。

Answer 1

假設每一行的customerName和customerGroup相同，則使用count和count以及group by distinct

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

Answer 2

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

我沒有在MySQL上運行它，但是我認為它應該可以工作。

Answer 3

您可以為此嘗試分組

Count(hasPurchase)購買Count(hasPurchase)

Count(Distinct hasPurchase)用於唯一的購買

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