How to access data from another database in SQL azure?

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SQL

Azure

I want to access data from another database in SQL Azure. I tried querying with three part naming convention
[databasename].[schemaname}. [tablename} and also with four part naming convention
[databaseservername].[databasename].[schemaname}.[tablename} But getting exception:

Reference to database and/or server name  is not supported in this version of SQL Server.

What I have tried:

I tried querying with  three part naming convention
[databasename].[schemaname}. [tablename} and also with four part naming convention
[databaseservername].[databasename].[schemaname}.[tablename} But getting exception:

<pre>Reference to database and/or server name  is not supported in this version of SQL Server.