Question

UserName           |         Person1   |     Person2    |     Person3


Kapil              |         Null      |       Null     |     Dks


Kapil              |         Dks       |       AA       |     Null

Kapil              |         SKS       |       AA       |     Dks

欲望输出：

User_Name   Person    Count

Kapil       Dks       3

Kapil       SKS       1

Kapil       AA        2

Kapil       Null      0

我不想在我的输出中计算空值。任何人都可以帮助我???

Answer 1

要获取所需数据，您需要取消数据。使用union all：

这是一种简单的方法

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;

如果您根本不想要行，请使用where：

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;

但是，您所需的输出表明您希望行数为0。

编辑：

要计算非空白值，这里有一种方法：

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;

更清楚的方法是写这个：

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

Answer 2

试试这个：

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;

当我从我的表SQL Server 2008中计算名称时，我不想要空值

2 个答案: