Joining MS SqlServer Data With Oracle Data

OK so there is some data in an Oracle DB that I need to query and analyze.  Unfortunately, the criteria for selecting/grouping the data is stored in a MS Sql Server DB.  This cannot be changed. 

SqlServer
Group Name       ID#      Item     Condition
AAA123              1         a              1
AAA123              2         a              1
AAA123              3         a              1
AAA123              4         a              2
AAA123              5         a              2
AAA123              1         b              3
AAA123              2         b              4
AAA123              3         b              3
AAA123              4         b              4
AAA123              5         b              3
BBB123              1         a              1
BBB123              2         a              1
BBB123              3         a              2
BBB123              4         a              2
BBB123              5         a              2

Oracle
Group Name       ID#     Value
AAA123              1          50%
AAA123              2          55%
AAA123              3          60%
AAA123              4          80%
AAA123              5          70%
BBB123              1          35%
BBB123              2          45%
BBB123              3          50%
BBB123              4          50%
BBB123              5          80%

 I need to be able to get this:
Group Name  Item   Condition Value
AAA123          a           1          55%
AAA123          a           2          75%
AAA123          b           3          60%
AAA123          b           4          67.5%
BBB123          a           1          40%
BBB123          a           2          60%

 Any idea how I can get the data from these two DBs to talk to each other?  Thanks.