sqlのidでグループから名前を取得する方法

Question

私は顧客グループのテーブルを持っていますが、私はグループの名前（およびNotesと呼ばれる別の値）を選択したいが、グループではそれもできないグループ全体で同じ名前とメモの価値があります。

select cg.idCustomerGroup, 
     sum(case when c.type = 'child' then 1 else 0 end) as Children, 
     sum(case when c.type = 'adult' then 1 else 0 end) as Adults, 
     sum(case when c.type = 'senior' then 1 else 0 end) as Seniors 
from CustomersGroups cg 
    inner Join CustomersInGroup cig 
     on cg.idCustomerGroup = cig.idCustomerGroup 
    inner Join Customers c 
     on c.idCustomer = cig.idCustomer 
Group by cg.idCustomerGroup 

Answer 1

あなたはGROUP BYでグループの名前やメモを含める必要があります：

select cg.idCustomerGroup, cg.Name, cg.Notes, 
     sum(case when c.type = 'child' then 1 else 0 end) as Children, 
     sum(case when c.type = 'adult' then 1 else 0 end) as Adults, 
     sum(case when c.type = 'senior' then 1 else 0 end) as Seniors 
from CustomersGroups cg 
    inner Join CustomersInGroup cig 
     on cg.idCustomerGroup = cig.idCustomerGroup 
    inner Join Customers c 
     on c.idCustomer = cig.idCustomer 
Group by cg.idCustomerGroup, cg.Name, cg.Notes