compare same column values in 2 oracle tables that has different structure

I have a similar column in 2 tables call order_id that I want to compare and highlight the differences - meaning if the column order_id is there in table1 and not table2 vice versa if it null highlight no value in table1 and value in table2 - there isn't any primary keys in both tables but we need to compare the columns - how can we go about doing this?
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select 'only in table1',  order_id from table1 where order_id is not null
select 'only in table1',  order_id from table2 where order_id is not null
select 'only in table2',  order_id from table2 where order_id is not null
select 'only in table2',  order_id from table1 where order_id is not null
order by 2,1

This method will show no differences if order_id appears 2 times in table1 and als 1 time in table2

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Devinder Singh VirdiLead Oracle DBA TeamCommented:
Another method.
select distinct t1.p1 from temp_dev2 t1, temp_dev3 t2 where t1.p1 = t2.a(+) and t2.a is null
select distinct t2.a from temp_dev2 t1, temp_dev3 t2 where t1.p1(+) = t2.a and t1.p1 is null

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