MySQL查詢發現SHOPNAME開在某些日子

Question

我需要一個MySQL查詢找到SHOPNAME在特定日子開放，

我Shop_availability表保存shop_name & openday。

這樣的表格。

shop_name openday 
------------------------ 
    shop-A  Monday 
    shop-A  Tuesday 
    shop-A  Wednesday 
    shop-A  Thursday 
    shop-A  Friday 
    shop-B  Monday 
    shop-B  Tuesday 

我想shop_name這在週一打開，週五

Select * availability WHERE openday IN('Monday','Friday') 

上面的查詢不工作，

請幫助我，謝謝，

Answer 1

關閉，但你要聚集：

SELECT a.shop_name 
FROM availability a 
WHERE a.openday IN ('Monday', 'Friday') 
GROUP BY a.shop_name 
HAVING COUNT(*) = 2; 

的HAVING子句用於驗證是否有兩場比賽在天（天數你正在尋找）。據推測，你的原始數據中沒有重複。

Answer 2

您需要組由商店，然後只採取兩個公開日（count(*) = 2）

select shop_name 
from availability 
where openday IN('Monday','Friday') 
group by shop_name 
having count(*) = 2