MDX: Combining output for different criteria - ssas

Question

I am new to MDX queries, and working in SSAS. I have two queries that are working suitably, but I want their output combined in a single result. The two queries differ in the cities selected by their where clauses, but they both come from the same cube and use the same measure.
A_to_B: Supplier city A to Consumer city B
SELECT { [Measures].[Quantity - Transactions] } ON COLUMNS,
{ [Tb Product].[Name].[Name].ALLMEMBERS } ON ROWS
FROM [Cube]
WHERE ([Tb Supplier].[City].&[A],
[Tb Consumer].[City].&[B])
B_to_A: Supplier city B to Consumer city A
SELECT { [Measures].[Quantity - Transactions] } ON COLUMNS,
{ [Tb Product].[Name].[Name].ALLMEMBERS } ON ROWS
FROM [Cube]
WHERE ([Tb Supplier].[City].&[B],
[Tb Consumer].[City].&[A])
Is there a way for the output of these queries to be produced side-by-side by Product, like this? In SQL I would have used a FULL OUTER JOIN, but I can't figure out the equivalent in MDX.
| | A_to_B | B_to_A |
| ProductA | 10 | 2 |
| ProductB | 100 | 0 |
| ProductC | 0 | 99 |

Answer 1

Simply move you Where statements to columns:
Select
{[Measures].[Quantity - Transactions]} *
{
([Tb Supplier].[City].&[B], [Tb Consumer].[City].&[A]),
([Tb Supplier].[City].&[A], [Tb Consumer].[City].&[B])
} on 0,
{[Tb Product].[Name].[Name].AllMembers} on 1
From [Cube]
You may create calculated members in order to unite two tuples:
With
Member [Tb Supplier].[City].[B2A] as
Aggregate([Tb Supplier].[City].&[B], [Tb Consumer].[City].&[A])
Member [Tb Supplier].[City].[A2B] as
Aggregate([Tb Supplier].[City].&[A], [Tb Consumer].[City].&[B])
Select
{[Tb Supplier].[City].[A2B],[Tb Supplier].[City].[B2A]} on 0
From [Cube]
Where ([Measures].[Quantity - Transactions])

Answer 2

I tested this script and it throws an exception:
SELECT
{[Measures].[Internet Sales Amount]}
*
{
{[Geography].[Geography].[Country].&[United States] * [Product].[Category].&[1]}
,{[Geography].[Geography].[Country].&[France] * [Product].[Category].&[3]}
} ON 0
,{[Date].[Calendar].[Date].&[20070801]} ON 1
FROM [Adventure Works];
This message:
Query (5, 7) The function expects a tuple set expression for the 1
argument. A string or numeric expression was used.
This is because you need to make either side of the cross-join specifically a set - without extra brackets it does not know this and throws an exception.
So this is the "perfect" version of the script:
SELECT
{[Measures].[Internet Sales Amount]}
*
{
{[Geography].[Geography].[Country].&[United States]} * {[Product].[Category].&[1]}
,{[Geography].[Geography].[Country].&[France]} * {[Product].[Category].&[3]}
} ON 0
,{[Date].[Calendar].[Date].&[20070801]} ON 1
FROM [Adventure Works];
I'd prefer to move the measure to the WHERE clause and also get rid of some of the redundant braces:
SELECT
{
{[Geography].[Geography].[Country].&[United States]}
*
{[Product].[Category].&[1]}
,
{[Geography].[Geography].[Country].&[France]}
*
{[Product].[Category].&[3]}
} ON 0
,[Date].[Calendar].[Date].&[20070801] ON 1
FROM [Adventure Works]
WHERE
[Measures].[Internet Sales Amount];
Translated to your cube:
SELECT
{
{[Tb Supplier].[City].&[B]} * {[Tb Consumer].[City].&[A]}
,
{[Tb Supplier].[City].&[A]} * {[Tb Consumer].[City].&[B]}
} ON 0
,[Tb Product].[Name].[Name].ALLMEMBERS ON 1
FROM [Cube]
WHERE
[Measures].[Quantity - Transactions];

Answer 3

Building on the others, here is one that replaces nulls with zeros in the output.
With
Member [Tb Supplier].[City].[B2A] as
Aggregate([Tb Supplier].[City].&[B], [Tb Consumer].[City].&[A])
Member [Tb Supplier].[City].[A2B] as
Aggregate([Tb Supplier].[City].&[A], [Tb Consumer].[City].&[B])
Member [Measures].[Quantity_Transactions] as
Iif( IsEmpty( [Measures].[Quantity - Transactions] ),
0,
[Measures].[Quantity - Transactions] )
SELECT
{ [Measures].[Quantity_Transactions] } *
{ [Tb Supplier].[City].[B2A],
[Tb Supplier].[City].[A2B] } on COLUMNS
, [Tb Product].[Name].[Name].ALLMEMBERS ON ROWS
FROM [Cube]