SQL>
SQL> declare
2 a number :=20;
3 b number :=-40;
4 string varchar2(50);
5 begin
6 string :=case
7 when (a>b)then 'A is greater than B'
8 when (a 9 else
10 'A is equal to B'
11 end;
12 dbms_output.put_line(string);
13 end;
14 /
A is greater than B
PL/SQL procedure successfully completed.
SQL>