The CData Power BI Connector for Twilio supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT Accounts.Name, Calls.Price FROM Accounts, Calls WHERE Accounts.Sid=Calls.AccountSid

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

SELECT Accounts.Name, Calls.Price FROM Accounts LEFT OUTER JOIN Calls ON Accounts.Sid=Calls.AccountSid