How to modify the sql

Question

1 --for dev
2-prod
1&2 for prod&Dev
For a particular project i need to be displayed only one code
either dev,prod,dev&prod if code is both 1 & 2.
select decode(c.code,1,'DEV',2,'Prod',1,(1,2),'Dev&Prod' ) env from temp;
Thanks

Answer 1

same thing in pl/sql
here is the test
SQL> ed
Wrote file afiedt.buf
  1  declare
  2  var varchar2(50);
  3  begin
  4  with t as
  5    (select '1,2' code from dual
  6      )
  7  select decode(code, '1', 'DEV', '2', 'Prod', '1,2', 'Dev'||'&'||'prod') into var from t
  8  dbms_output.put_line(var);
  9* end;
SQL> /
Dev&prod
PL/SQL procedure successfully completed.
SQL> ed
Wrote file afiedt.buf
  1  declare
  2  var varchar2(50);
  3  begin
  4  with t as
  5    (select '1,2' code from dual
  6      )
  7  select decode(code, '1', 'DEV', '2', 'Prod', '1,2', 'Dev''&''prod') into var from t;
  8  dbms_output.put_line(var);
  9* end;
SQL> /
Dev'&'prod
PL/SQL procedure successfully completed.
SQL> ed
Wrote file afiedt.buf
  1  declare
  2  var varchar2(50);
  3  begin
  4  with t as
  5    (select '1,2' code from dual
  6      )
  7  select decode(code, '1', 'DEV', '2', 'Prod', '1,2', 'Dev&prod') into var from t;
  8  dbms_output.put_line(var);
  9* end;
SQL> /
Enter value for prod: w
old   7: select decode(code, '1', 'DEV', '2', 'Prod', '1,2', 'Dev&prod') into var from t;
new   7: select decode(code, '1', 'DEV', '2', 'Prod', '1,2', 'Devw') into var from t;
Devw
PL/SQL procedure successfully completed.