Sql查询修改

Question

我有一个名为Customer的表，具有以下架构。

Create Table Customer(id Number,customer_type varchar(20),customer_status char(1),account_number varchar(20));

Insert into Customer(id,customer_type,customer_status,account_number)values(123,'RETAIL','A','32456798');
Insert into Customer(id,customer_type,customer_status,account_number)values(123,'RETAIL','I','92456798');
Insert into Customer(id,customer_type,customer_status,account_number)values(123,'RETAIL','P','22456798');
Insert into Customer(id,customer_type,customer_status,account_number)values(123,'PERSONAL','A','42456798');
Insert into Customer(id,customer_type,customer_status,account_number)values(123,'PERSONAL','I','52456798');
Insert into Customer(id,customer_type,customer_status,account_number)values(123,'PERSONAL','P','62456798');
commit;

我正在尝试获取客户状态为活跃的ID。Customer_type可以为两种类型：[[RETAIL或PERSONAL。如果ID具有任何有效的帐户，则我只想返回Retail true，否则为false，与个人相同我在下面的查询中尝试过，但是在返回ID时遇到问题

select REATIL,PERSONAL from (select  case  when customer_status = 'A' then 'Y' else 'N' end as REATIL from Customer where customer_status='A' and customer_type='RETAIL')
,(select  id, case  when customer_status = 'A' then 'Y' else 'N' end as PERSONAL from Customer where customer_status='A' and customer_type='PERSONAL');

预期输出：

可以提供帮助。

Answer 1

尝试使用联接。以下查询返回帐号而不是'Y'

select C.id, R.account_number, P.account_number from Customer C
    left join Customer R on R.id = c.id
    left join Customer P on P.id = c.id
    where   R.customer_type = 'RETAIL'   
        and R.customer_status = 'A' 
        and P.customer_type = 'PERSONAL' 
        and P.customer_status = 'A'

Answer 2

尝试以下操作（根据您的进一步要求进行修改）

select  ID, 
        Case When customer_type = 'RETAIL' and customer_status = 'A' then 'Y'   
            When customer_type = 'RETAIL' and customer_status != 'A' then 'N' 
            Else ''
        End as Retail,
        Case When customer_type = 'PERSONAL' and customer_status = 'A' then 'Y'   
            When customer_type = 'PERSONAL' and customer_status != 'A' then 'N' 
            Else ''
        End as PERSONAL,
        account_number
from  Customer