To perform outer joins, an additional configuration within the Join tool itself is needed, not an additional tool. Users simply need to set the properties of the Join tool to specify the type of outer join they wish to perform, such as left outer, right outer, or full outer joins.
The main answer to the question about what other tool needs to be added to a Join tool to perform outer joins is an additional configuration within the Join tool itself. In many data processing environments, such as SQL databases and data analytics platforms, the Join tool's properties can often be set to perform different types of joins, including inner, left outer, right outer, and full outer joins. An outer join is used to combine rows from two tables even if there are no matching rows in one table. This can be contrasted with an inner join, which only combines rows with matching values in both tables.
In order to perform an outer join using a Join tool, there is generally no need to add another tool; instead, the explanation involves configuring the Join tool to specify which type of outer join you want to perform. For instance, in a platform like SQL, one might specify LEFT JOIN or RIGHT JOIN to perform a left or right outer join, respectively, or FULL JOIN to perform a full outer join. The actual configuration steps may vary depending on the software or platform being used.