All Member Properties - Name, Key and Level

I just tried to find some more information about the All Member in SSAS dimension hierarchies and since it was not readily available, I had to experiment a bit, so I thought I may as well share my findings. For some these may be obvious, but for some they could as well be interesting.

So in brief, I will explore the Name, Key and Level of an All member in a dimension hierarchy. The one of choice was the Customer dimension and Customer Geography hierarchy in Adventure Works. There is an All member, called All Customers. As expected, .PROPERTIES("MEMBER_NAME") gives us "All Customers":

WITH
MEMBER [Measures].[test] AS
  [Customer].[Customer Geography].CurrentMember.PROPERTIES("MEMBER_NAME")
SELECT
{
  [Measures].[test]
} ON 0,
{
  [Customer].[Customer Geography].Members
} ON 1
FROM [Adventure Works]

The first row shows us: All Customers.

Now, let's see what its key is:

WITH
MEMBER [Measures].[test] AS
  [Customer].[Customer Geography].CurrentMember.PROPERTIES("KEY")
SELECT
{
  [Measures].[test]
} ON 0,
{
  [Customer].[Customer Geography].Members
} ON 1
FROM [Adventure Works]

This gives us 0.

And its level:

WITH
MEMBER [Measures].[test] AS
  [Customer].[Customer Geography].CurrentMember.Level.Name
SELECT
{
  [Measures].[test]
} ON 0,
{
  [Customer].[Customer Geography].Members
} ON 1
FROM [Adventure Works]

The result this time is: (All).

So far so good. Now let's try using these to get only the All member:

SELECT
{
  [Customer].[Customer Geography].[All Customers]
} ON 0
FROM [Adventure Works]

This works. Now if we try the Key:

SELECT
{
  [Customer].[Customer Geography].&[0]
} ON 0
FROM [Adventure Works]

Interestingly, since the All member is a calculated member and has no physical key, if we try to use the one that SSAS gave us does not actually work - we get nothing on Axis 0.

Using the level works:

SELECT
{
  [Customer].[Customer Geography].[(All)].Item(0)
} ON 0
FROM [Adventure Works]

Also, after experimenting a bit further:

SELECT
{
  [Customer].[Customer Geography].[All]
} ON 0
FROM [Adventure Works]

This query also works even though the All member name is [All Customers], not just [All]. However, Analysis Services does recognise [All].

In summary, the most robust options for referencing the All member in a dimension hierarchy that I have found are:

1. [Dimension].[Hierarchy].[(All)].Item(0)
2. [Dimension].[Hierarchy].[All]

These will always work - regardless of the dimension and hierarchy names.

Another option is using [Dimension].[Hierarchy].[] - e.g. [Customer].[Customer Hierarchy].[All Customers]

And, one that does not work - referencing through its alleged key: [Customer].[Customer Hierarchy].&[0]

Please let me know if there are any better alternatives, or why it would give me a key of 0 for the All member and would not work when actually using this key.