Difference in results in the scenarios below on running MDX

Question

Hi,
I am a newbie to MDX and nowadys runnning and testing MDX queries to understand the nitty-gritties of the language.
Can someone please explain why the below MDX queries are giving varying outputs. I want to know whats happening below.
query 1
--Error message: Infinite recursion detected. The loop of dependencies is: sumallsales -> sumallsales.
with
member [Accident Date].[Year].sumallsales
as
sum([Accident Date].[MOnth].members, [Measures].[Claim As Of - Count])
member [Accident Date].[Year].aggregateallsales
as
aggregate([Accident Date].[MOnth].members, [Measures].[Claim As Of - Count])
select {[Accident Date].[Year].sumallsales, [Accident Date].[Year].aggregateallsales}
on 0,
[Client].[Client Name].members
on 1
from [AW Cube]
query 2
---all null values
with
member [Accident Date].[Year].sumallsales
as
sum([Accident Date].[MOnth].[all], [Measures].[Claim As Of - Count])
member [Accident Date].[Year].aggregateallsales
as
aggregate([Accident Date].[MOnth].[all], [Measures].[Claim As Of - Count])
select {[Accident Date].[Year].sumallsales, [Accident Date].[Year].aggregateallsales}
on 0,
[Client].[Client Name].members
on 1
from [AW Cube]
query 3
---equal and correct
with
member [Accident Date].[Year].sumallsales
as
sum([Accident Date].[Year].[all], [Measures].[Claim As Of - Count])
member [Accident Date].[Year].aggregateallsales
as
aggregate([Accident Date].[Year].[all], [Measures].[Claim As Of - Count])
select {[Accident Date].[Year].sumallsales, [Accident Date].[Year].aggregateallsales}
on 0,
[Client].[Client Name].members
on 1
from [AW Cube]
query 4
---all null values
with
member [Accident Date].[Year].sumallsales
as
sum([Accident Date].[Year].currentmember, [Measures].[Claim As Of - Count])
member [Accident Date].[Year].aggregateallsales
as
aggregate([Accident Date].[Year].currentmember, [Measures].[Claim As Of - Count])
select {[Accident Date].[Year].sumallsales, [Accident Date].[Year].aggregateallsales}
on 0,
[Client].[Client Name].members
on 1
from [AW Cube]
query 5
---the values using sum function are double than that using aggregate
with
member [Accident Date].[Year].sumallsales
as
sum([Accident Date].[Year].members, [Measures].[Claim As Of - Count])
member [Accident Date].[Year].aggregateallsales
as
aggregate([Accident Date].[Year].members, [Measures].[Claim As Of - Count])
select {[Accident Date].[Year].sumallsales, [Accident Date].[Year].aggregateallsales}
on 0,
[Client].[Client Name].members
on 1
from [AW Cube]
Much appreciated!
-Sourav

Answer 1

It's hard to explain all the queries, you need to understand them by yourself, here is a good link for learning MDX.
http://www.databasejournal.com/features/mssql/article.php/1495511/MDX-at-First-Glance-Introduction-to-SQL-Server-MDX-Essentials.htm