How to divide logic flow stream in sp

Hi, all
I have a call from other app that should return SELECT results with 4 different WHERE clause, depending which set of params caller specifies, and which left like null.
So I need to separate logic in my sp (caller insist on having single sp for all). i.e
procedure sp01( param1=22, param2=33, param3=null, param4=null) ---> SELECT COLUMN_LIST FROM TABLE WHERE COLUMN1=PARAM1 AND COLUMN2=PARAM2;
procedure sp01( param1=null, param2=null, param3='abc', param4=null) ---> SELECT COLUMN_LIST FROM TABLE WHERE COLUMN3=PARAM3;
procedure sp01( param1=null, param2=null, param3=null, param4='xyz') ---> SELECT COLUMN_LIST FROM TABLE WHERE COLUMN4=PARAM4;
etc..
COLUMN_LIST stays the same for all SELECTS just different WHEREs. So beinig new to pl I interesteing how do you think better implement this logic in single sp, can I use any VAR for WHERE ? Or maybe there are some other clever tricks I go with to make it looks sound.
I can think go with number of IFs:
IF (PARAM1 IS NOT NULL ) AND (PARAM2 NOT NULL) THEN
SELECT #1
IF (PARAM2 IS NOT NULL ) THEN
SELECT #2
etc..
Apreciate you comments
Tx
T

Another option (which is not Dynamic SQL).
select <columns>
from table
where (column1 = param1 or param1 is null)
and   (column2 = param2 or param2 is null)
and   (column3 = param3 or param3 is null)
and   (column4 = param4 or param4 is null)Either approach (this or dynamic) could have potential performance drawbacks. It will depend highly on your situation so try them both out (in as real world simulation as you can get) and take some metrics.

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