Oracle 18c

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create table test (id, string) as
select 1, 'AAA' from dual
union all
select 2, 'BBB' from dual
2 rows affected

create or replace trigger trg_bu_r
  before update on test
  for each row
begin
  dbms_output.put_line('Before row');
end;
/
create or replace trigger trg_au_r
  after update on test
  for each row
begin
  dbms_output.put_line('After row');
end;
/
create or replace trigger trg_bu_s
  before update on test
begin
  dbms_output.put_line('Before statement');
end;
/
create or replace trigger trg_au_s
  after update on test
begin
  dbms_output.put_line('After statement');
end;
/
begin
  dbms_output.enable;
  update test set string = 'ZZZ' where id = -1;
end;
/
1 rows affected

dbms_output:
Before statement
After statement

begin
  dbms_output.enable;
  update test set string = 'CCC' where id = 1;
end;
/
1 rows affected

dbms_output:
Before statement
Before row
After row
After statement

begin
  dbms_output.enable;
  update test set string = 'DDD';
end;
/
1 rows affected

dbms_output:
Before statement
Before row
After row
Before row
After row
After statement