SQL Server子查询结果输出

Question

我想创建一个结果，列出昨天添加到数据库的所有客户端，然后是同一组客户端的单独列，但只有那些没有电子邮件地址的列，所以我们可以看到哪个CSR代表没有添加电子邮件地址，我有编写子查询以计算问题。下面是我的代码，它使用两个表CLIENT和CONTACT他们在ACCT_NO字段上加入

我正在使用SQL Server Management Studio

select 
    count(distinct c.acct_no) as Total, ADDED_BY 
from 
    client c
inner join 
    (select 
         count(distinct ct.acct_no) acct_NO 
     from 
         contact CT 
     inner join 
         client on client.acct_no = ct.ACCT_NO 
                and ct.EMAILADDR1 = ''
                and ct.[PRIMARY] = 'A' 
     group by 
         ct.ACCT_NO) x on c.ACCT_NO = x.acct_NO 
where 
    c.DATE_ADDED = CONVERT(varchar(10), GETDATE()-10, 121)
group by 
    c.ADDED_BY

Answer 1

您可以使用count(distinct case ...作为条件总和，例如：

select  ADDED_BY
,       count(distinct case when client.EMAILADDR1 is null then client.ACCT_NO end) 
            as TotalWithoutMail
,       count(distinct case when client.EMAILADDR1 is not null then client.ACCT_NO end) 
            as TotalWithMail
from    contact
jon     client
on      client.ACCT_NO = contact.ACCT_NO
group by
        ADDED_BY