I don't understand the sense of you're answer regarding the question. I know how to proceed to join multiple datasource. That i ask to myself is when use the way you show and the previous method.
Maybe with screen it will be clearer :
OLD WAY : When to use it ?
NEW WAY : When to use it ?
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firstly i will discuss about old method:
Data blending happens at time of query, after you’ve made data connections, performance can be slow, but in many cases this is still the best option. Second, you can’t blend two cubes.
Fortunately, you can blend a single cube with other data sources, and there are many other data sources that you can blend. To start, you can combine data from:
- two different databases (same or different servers),
- a database and an Excel file,
- a cube and a database or Excel file, or
- multiple files.
Creating joins at the data connection level is efficient: once you join data sources in a workbook, the final data source can easily be shared with Tableau Server, because data joining happens at the data connection level, not after a query is generated within a view.Using joins to combine data is easy to do and Tableau performance will be much better than if you use blending.
So we have to decide which will be suitable for our requirement.
Hope this will answer your query.
That is not old/new, that's different type of data connection function.
"Old" you say is Data blending and "New" you say is data joining.
Both version 9 and 10 have both options.
And you can refer below post as example to understand the difference of two functions..