SQL>
SQL> declare
2 v NUMBER;
3 begin
4 if v = 1 then
5 DBMS_OUTPUT.put_line('Equal to 1');
6 elsif v!= 1 then
7 DBMS_OUTPUT.put_line('Not equal to 1');
8 elsif v = v then
9 DBMS_OUTPUT.put_line('Equal to itself');
10 else
11 DBMS_OUTPUT.put_line('Undefined result');
12 end if;
13 v:=v+1;
14 DBMS_OUTPUT.put_line('New value: <'||v||'>');
15 end;
16 /
Undefined result
New value: <>
PL/SQL procedure successfully completed.
SQL>