How to accomplish outer join between two datasets in BI Publisher

Example : 

     Datasource : A                          Datasource : B 

     DataSet 1  : EMPLID                DataSet 2 : EMPLID

                         1                                               3

                         2                                               4

                         3                                               5

                         4

                         5

                         6

    Question : How to create a report that looks like

     

         EMPLID_Set1           EMPLID_Set2

          1

          2   

          3                               3

          4                               4

          5                               5

          6