Diff "full outer join" va. "(+)" SELECT syntax ?

Question

As far as I know there are two ways of defining an outer join:
Select ... from tab1 t1 full outer join tab2 t2 on t1.id =t2.id;
or:
Select ... from tab1 t1, tab2 t2 where t1.id = t2.id(+)
Are they absolutely equivialent?
Which are the most common one?
Which are used on other databases (DB2, MySQL) as well?
Can I put an additional WHERE clause at the end in the first statement:
Select ... from tab1 t1 full outer join tab2 t2 on t1.id =t2.id WHERE .....;

Answer 1

Select ... from tab1 t1 full outer join tab2 t2 on t1.id =t2.id;This is FULL OUTER JOIN
Select ... from tab1 t1, tab2 t2 where t1.id = t2.id(+)This is LEFT OUTER JOIN.
They are entirely different.
FULL OUTER JOIN - Gets all the rows from tab1 and tab2
LEFT OUTER JOIN - Gets all the rows from tab1 and only the row that matches with join condition from tab2.
Here is a simple test.
create table tab1(id integer)
create table tab2(id integer)
begin
  insert into tab1 values(1);
  insert into tab1 values(2);
  insert into tab1 values(3);
end;
begin
  insert into tab2 values(3);
  insert into tab2 values(4);
  insert into tab2 values(5);
end;
Select t1.id, t2.id
  from tab1 t1 full outer join tab2 t2
    on t1.id =t2.id
Select t1.id, t2.id
  from tab1 t1, tab2 t2
where t1.id = t2.id(+)
/Run it and see the result.