在SQL分组空和空值作为一个

Question

我有一个查询，其提供在数据库中用于事物不同类别的细分：

select categories, count(*) from products 
group by categories 

的有关资料是这样的：

NULL    56 
        42 
FooCategory   12 
BlahCategory  2 

我想团体NULL和<blank>

NoCategory   98 
FooCategory   12 
BlahCategory  2 

Answer 1

尝试

select categories, 
case when categories is null or categories = ' ' 
then 'noCategory' else categories end as grouped, 
count(*) 
from products 
group by grouped 

Answer 2

尝试

select ISNULL(categories,'') as Categories, count(*) from products 
group by ISNULL(categories,'') 

UPDATE

在这里看到参数所需

ISNULL (check_expression , replacement_value)