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How to perform FULL OUTER JOIN in ORACLE using ' ' operator?
select a.field1, b.field2
from table_a a, table_b b
where a.id = b.id(+)
union all
select a.field1, b.field2
from table_a a, table b b
where a.id(+) = b.id
      and a.id is null

select a.field1, b.field2
from table_a a full outer join table_b b
on a.id = b.id

with
a as
   (select 'A' tbl, level id from dual connect by level < 1000),
b as
   (select 'B' tbl, level + 500 id from dual connect by level < 1000)
select a.tbl, a.id, b.tbl, b.id from a, b where a.id = b.id(+)
union all
select a.tbl, a.id, b.tbl, b.id from a, b where a.id(+) = b.id and a.id is null

with
a as
   (select 'A' tbl, level id from dual connect by level < 1000),
b as
   (select 'B' tbl, level + 500 id from dual connect by level < 1000)
select a.tbl, a.id, b.tbl, b.id from a full outer join b on a.id = b.id