On Tuesday 15 Jul 2003 7:38 pm, Vincent Hikida wrote:
> OK. This has been bothering me. I finally recreated what I remember as an
> anomoly in Oracle involving nulls. It also works the same way in
> PostgreSQL. I guess in mind I extrapolated that there was a problem with
> "WHERE 1 IN (1,2,NULL)" w
ctually
> > stung by this particular while using it in Oracle.
> >
> > Vincent Hikida,
> > Member of Technical Staff - Urbana Software, Inc.
> > "A Personalized Learning Experience"
> >
> > www.UrbanaSoft.com
> >
> > - Original Mess
On Sun, 13 Jul 2003, Vincent Hikida wrote:
> Oops forgot to cc the list.
>
> > Unfortunately, intra-row functions using nulls return nulls. Inter-row
> > functions "usually" ignore the nulls. I think there may be a few
> exceptions.
> > Though there is a relational theory which has is rigorously
On Sun, Jul 13, 2003 at 11:14:15PM -0700, Vincent Hikida wrote:
> Oops forgot to cc the list.
> > I just happened to notice another difference recently between Oracle and
> > Postgresql for the clause
> >
> > WHERE 1 IN (1,2,NULL)
> >
> > In Oracle, this clause is false because 1 compared to a NULL
Jean-Christian Imbeault wrote:
> Why is it that "select null + 1" gives null but "select sum(a) from
> table" where there are null entries returns an integer?
>
> Shouldn't the sum() and "+" operators behave the same?
---
SQL92 (6.5 ):
1) Case:
a) If COUNT(*) is specified, then the result is
Jean-Christian Imbeault wrote:
Shouldn't the sum() and "+" operators behave the same?
No, see SQL99, Section 6.16, General Rules 1.b:
"Otherwise, let TX be the single-column table that is the result of
applying the to each row of T and eliminating null
values. If one or more null values are eli
ssage -
> From: "Jean-Christian Imbeault" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Sunday, July 13, 2003 10:42 PM
> Subject: [GENERAL] select null + 0 question
>
>
> > Why is it that "select null + 1" gives null but &
: Montag, 14. Juli 2003 07:42
An: [EMAIL PROTECTED]
Betreff: [GENERAL] select null + 0 question
Why is it that "select null + 1" gives null but "select sum(a) from
table" where there are null entries returns an integer?
Shouldn't the sum() and "+" operators beha
Why is it that "select null + 1" gives null but "select sum(a) from
table" where there are null entries returns an integer?
Shouldn't the sum() and "+" operators behave the same?
TAL=# select null + 0;
?column?
--
(1 row)
TAL=# select * from a;
a
---
1
(3 rows)
TAL=# select sum(a) fr
