How does Merged Dimensions Work in WebI created on SAP BI Queries

Hi,
I need to know how does Merge dimensions work in WebI when using SAP BI Query as source?
Below is my understanding when connection is defined for the universe on oracle database:
1) To get the data in merged dimensions, there must be physical join (Either Direct or vai some other tables) between different tables at backend level (This means  there  must be join between tables in Oracle database.)
2) we get the UNION of data when dimensions are merged at webI level.
I dont know how this works in SAP BI.
Since there is different data model defined for different BI Queries in SAP , and for each BI Query and there is seperate Universe, So how can you get correct data in WebI when there is no connections in DSO's used in different BI queries?
Can any one suggest me the way data apperas in merged dimensions for WebI created on SAP BI?

I assume we are only talking about merging dimensions in Web Intelligence here and not on the BW backend. this is a client side mere where you have 2 resultsets.
if you want to do this on the BI server side it would be a multi-provider combining different InfoProviders - or a InfoSet - depending on the join type you need. MultiProvider is a union, Infoset allows you to choose
Ingo

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