求解mdx的case语句问题

[红火火火]

我的问题是这样的，立方体里有某业务的金额，需要查出每个客户所有金额中产品A的金额占比，还要占比区间，mdx如下：

with 
member [Measures].[产品A金额] as sum({[Prod].[Prod_Name].&[产品A]}
,[Measures].[Amount])

member [Measures].[产品A占比] as [Measures].[产品A金额]/[Measures].[Amount] 
//, FORMAT_STRING ='0.00%'

member [Measures].[产品A占比区间] as 
	case when [Measures].[产品A占比]<0.3 then '30%以下' 
        when  [Measures].[产品A占比]>=0.3 and [Measures].[产品A占比]<0.5 then '30%至50%'
	else '50%以上' end
        
	
select {
	[Measures].[Amount]
	,[Measures].[产品A金额]
	,[Measures].[产品A占比]
	,[Measures].[产品A占比区间] 
} on 0
,non empty [Big_Brand_Cust].[Cust_Name].[Cust_Name] on 1
from [BIG_BRAND_SFE_001]
where {[Date].[月份].&[2012-02-01T00:00:00]}

如果不加[产品A占比区间]这段case语句，得出的结果是正常的，只显示出有业务发生的客户62条数据，但是如果加上这段case语句，就显示出了所有的客户，数据量达到了好几万且金额等全是null，哪里出问题了呢？

[红火火火]

解决啦，代码改动了一点点，增加了对占比的为空判断，vastm的思路是对的，虽然语法不对，嘿嘿。
改过之后的代码如下：

with 
member [Measures].[产品A金额] as sum({[Prod].[Prod_Name].&[产品A]}
,[Measures].[Amount])

member [Measures].[产品A占比] as [Measures].[产品A金额]/[Measures].[Amount] 
//, FORMAT_STRING ='0.00%'

member [Measures].[产品A占比区间] as 
    case  when [Measures].[产品A占比]=null then null
        when [Measures].[产品A占比]<0.3 then '30%以下' 
        when  [Measures].[产品A占比]>=0.3 and [Measures].[产品A占比]<0.5 then '30%至50%'
    else '50%以上' end
        
    
select {
    [Measures].[Amount]
    ,[Measures].[产品A金额]
    ,[Measures].[产品A占比]
    ,[Measures].[产品A占比区间] 
} on 0
,non empty [Big_Brand_Cust].[Cust_Name].[Cust_Name] on 1
from [BIG_BRAND_SFE_001]
where {[Date].[月份].&[2012-02-01T00:00:00]}

[APHY]

--数据库的表数据是不是有些数据是NULL？判断一下应该就可以了


with 
member [Measures].[产品A金额] as sum({[Prod].[Prod_Name].&[产品A]}
,[Measures].[Amount])

member [Measures].[产品A占比] as [Measures].[产品A金额]/[Measures].[Amount] 
//, FORMAT_STRING ='0.00%'

member [Measures].[产品A占比区间] as 
    case ISNULL([Measures].[产品A占比],0)
        when [Measures].[产品A占比]<0.3 then '30%以下' 
        when [Measures].[产品A占比]=0 then '0' 
        when  [Measures].[产品A占比]>=0.3 and [Measures].[产品A占比]<0.5 then '30%至50%'
    else '50%以上' end
        
    
select {
    [Measures].[Amount]
    ,[Measures].[产品A金额]
    ,[Measures].[产品A占比]
    ,[Measures].[产品A占比区间] 
} on 0
,non empty [Big_Brand_Cust].[Cust_Name].[Cust_Name] on 1
from [BIG_BRAND_SFE_001]
where {[Date].[月份].&[2012-02-01T00:00:00]}

[APHY]

when [Measures].[产品A占比]=0 then '0' 不写也可以，因为0<0.3

[红火火火]

事实表里没有为null的数据，加上case语句之后出现了null是因为把维度表中没发生业务的也显示出来了，怎样才能去掉这些呢？