Filter函数详析

 

select
Filter(
[ Product ] . [ Category ] .Members,
[ Measures ] . [ Dollar Sales ] > 900000   //and   [ Measures ] . [ Unit Sales ] > 90000
)
on axis( 0 )
from Sales
Where ( [ Time ] . [ 2005 ] , [ Measures ] . [ Dollar Sales ] )

查询的结果是：

 

select
Filter(
[ Product ] . [ Category ] .Members,
[ Measures ] . [ Dollar Sales ] > 900000   and   [ Measures ] . [ Unit Sales ] > 90000  
)
on axis( 0 )
from Sales
Where ( [ Time ] . [ 2005 ] , [ Measures ] . [ Dollar Sales ] )

查询的结果是：

为什么Filter函数的加了and [Measures].[Unit Sales]>90000条件后，返回的列只有All呢，难道Filter函数只能用一个条件吗

 

select
Filter(
    [ Product ] . [ Category ] .Members,
    [ Measures ] . [ Dollar Sales ] > 1.4 *
    ( [ Measures ] . [ Dollar Sales ] ,
        [ Time ] . [ YQMD ] .CurrentMember.PrevMember
    )
)
on axis( 0 )
from Sales
Where ( [ Time ].[YQMD] . [ 2005 ] , [ Measures ] . [ Dollar Sales ] )

因为上下文的时间成员是[2005],则前一个时间成员应该是[2005], 即[Time].[YQMD].CurrentMember.PrevMember的成员是[2004]
 

 
因为上下文从每个维度中取出一个成员放入其中，所以在表达式中可以更多地依靠它进行查询。下面的查询与前面的查询结果一样，但却使用了不同的表达式，这是因为filter()函数中的上下文包含并使用了[measures].[Doolar Sales]
1.4*
    ([Measures].[Dollar Sales],
        [Time].[YQMD].CurrentMember.PrevMember
    )
改成了1.4*[Time].[YQMD].CurrentMember.PrevMember

select
Filter(
    [ Product ] . [ Category ] .Members,
    [ Measures ] . [ Dollar Sales ] >
    1.4 * [ Time ] . [ YQMD ] .CurrentMember.PrevMember
)
on axis( 0 )
from Sales
Where ( [ Time ].[YQMD] . [ 2005 ] , [ Measures ] . [ Dollar Sales ] )