我不知道'；当我从表SQL Server 2008中计算名称时，我不希望出现空值

期望输出：

UserName           |         Person1   |     Person2    |     Person3


Kapil              |         Null      |       Null     |     Dks


Kapil              |         Dks       |       AA       |     Null

Kapil              |         SKS       |       AA       |     Dks

---

我不想在输出中计算空值。有人能帮我吗？

要获取所需的数据，您需要取消填充数据。下面是一种使用

联合所有

的简单方法：

User_Name   Person    Count

Kapil       Dks       3

Kapil       SKS       1

Kapil       AA        2

Kapil       Null      0

如果根本不需要该行，请使用

where

：

select user_name, person, count(person)
from (select user_name, person1 as person from table t union all
      select user_name, person2 as person from table t union all
      select user_name, person3 as person from table t
     ) t
group by user_name, person;

但是，所需的输出表明您希望该行的计数为

0

编辑：

要计算非空值，有一种方法：

select user_name, person, count(*)
from (select user_name, person1 as person from table t union all
      select user_name, person2 as person from table t union all
      select user_name, person3 as person from table t
     ) t
where person is not null
group by user_name, person;

写这篇文章的更清晰的方式可能是：

select user_name, person, count(nullif(ltrim(rtrim(person)), '') )
from (select user_name, person1 as person from table t union all
      select user_name, person2 as person from table t union all
      select user_name, person3 as person from table t
     ) t
group by user_name, person;

试试这个：

select user_name, person, sum(case when ltrim(rtrim(person)) > '' then 1 else 0 end)

---

你试过什么？请添加您的代码。非常感谢Gordon。我得到了一个输出。但我发现的另一个问题是在我的表中，有些包含空白而不是Null。所以现在我得到了输出中的空行数。我怎样才能避免这样的空白值和它们的计数？？？？？谢谢。我得到了输出。但我发现的另一个问题是在我的表中，有些包含空白而不是Null。所以现在我得到了输出中的空行数。我怎样才能避免在我的输出中出现这样的空白值和它们的计数？？？？？天哪，太棒了。多谢萨哈什·沙阿。工作正常。非常感谢

SELECT User_Name, Person, COUNT(1) AS Count
FROM (SELECT User_Name, Person1 AS Person
      FROM tableA 
      UNION ALL 
      SELECT User_Name, Person2 AS Person
      FROM tableA 
      UNION ALL 
      SELECT User_Name, Person3 AS Person
      FROM tableA 
     ) AS A 
WHERE Person IS NOT NULL AND Person != ''
GROUP BY User_Name, Person;