Something weird with NULL operation
First I tried to create a view to simplify the experimental query:create or replace force view subquery as
select email from employees
where rownum<5
union
select null from dual
Note that I added a null value containing the line in the last row of the view.Then, I tried these two:
select * from subquery where email in (select * from subquery)
She returned 4 lines except for the null row.But with this code:
select email,(select * from subquery where email=s.email) from subquery s
The fifth line containing null is displayed. Should not be excluded also? Thank youPublished by: 801264 on November 16, 2010 22:46
the last query works fine. It ignores NULL values.
It is quite similar to an outer join (which is another possibility to demonstrate"associated NULL values" "):
SQL> with subquery
as (select email
from employees
where rownum < 5
union
select null from dual
)
--
--
select s1.email
from subquery s1, subquery s2
where s1.email = s2.email(+)
/
EMAIL
-------------------------------------
ABANDA
ABULL
ACABRIO
AERRAZUR
5 rows selected.
Is there any exception for NULL operation?
It is not an exception: it must be understood only when and where NULL operations apply.
Tags: Database
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