SQL question on an outer join

Hello,
 Learning SQL - will appreciate any help.
 Here is the case:

Two tables with 0..n relation****p
TableA                  TableB
-----------             --------------
ColA                    ColB
                           ColA_FK
                           Col_C

Data
TableA.ColA
====================
 1
 2

Table B
ColB   ColA_FK    Col_C
 11      2              12345
 12      2              99999

 Resultset:

 --------------------------------------
 ColA   ColB      Col_C
 --------------------------------------
 1       -        -
 2       12       99999

 In case no data exists in TableB for ColA=11,  1 from TableA shows up
in result without any data from TableB
 However, in case of 2 from ColA,  we want to record from TableB with
Col_C = 99999

I can do the outer join - however, how do I limit it so it picks only
the row with 9999?

Thanks in advance.
Fergus