The CData SSIS Components for Azure DevOps 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 Builds.BuildNumber FROM Builds INNER JOIN BuildDefinitions ON BuildDefinitions.Id = Builds.DefinitionId

Left Join

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

SELECT Builds.BuildNumber FROM Builds INNER JOIN BuildDefinitions ON BuildDefinitions.Id = Builds.DefinitionId