How to replace huge decode statements with lookups to some simple code/key

I have a legacy PL/SQL application, composed of many very huge decode statements. And the most terribe one is that the guys who develops the application left the company now, leaves no documentation.
We are trying to read and understand those PL/SQL programs, and I'm asked to replace those huge decode statements with lookups to some simple code/key tables? But I have no idea about how to design such code/key tables. Is there any one who has similar experience may help me? Besides code/key tables, any idea will be welcome.
Thank you very much!

Not sure what your data looks like but sometimes decode can be replaced with more appropriate functions, ie;
SQL> with t as (
   select 'DAY' a, 30 b, null c, null d from dual union all
   select null a, null b, 'MONTH' c, 12 from dual)
select coalesce(b,d)
from t
COALESCE(B,D)
           30
           12
2 rows selected.
SQL> with t as (
   select 'DAY' a, 30 b, null c, 0 d from dual union all
   select null a, 0 b, 'MONTH' c, 12 from dual)
select greatest(b,d)
from t
GREATEST(B,D)
           30
           12
2 rows selected.

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              //to remove all the elements from the Vector
              musicDetails.removeAllElements();
         //get Searched Music Details and store in Results object which is stored in musicDetails vector
         public void getResults (String type, String searchQuery) {
              try {
                   Class.forName ("com.microsoft.jdbc.sqlserver.SQLServerDriver");
                   Connection con = DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=music","sa","kokkeng");
                   Statement stmt = con.createStatement();
                   String query = "SELECT * FROM MusicDetails WHERE "+type+" = '"+searchQuery+"'";
                   ResultSet rs = stmt.executeQuery(query);
                   while (rs.next()) {
                        String artist = rs.getString("Artist");
                        String title = rs.getString("Song");
                        String company = rs.getString("Company");
                        String album = rs.getString("Album");
                        String image_loc = rs.getString("Image");
                        Results details = new Results (artist,title,company,album,image_loc);
                        musicDetails.add(details);
                   stmt.close();
                   con.close();
              catch (Exception e) {
                   System.out.println(e.getMessage());
                   e.printStackTrace();
    with the above servlet i created, i can search out the data in the database which i've inserted through the insert statement. I still can't search for things i've keyed into the database directly using NJStar..
    thank you so much for helping.. really hope any one else who knows the answer to this will reply too... thank you all so much...
    -KK

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