| Lists: | pgsql-bugs |
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| From: | pgsql-bugs(at)postgresql(dot)org |
|---|---|
| To: | pgsql-bugs(at)postgresql(dot)org |
| Subject: | Bug #702: NULLs order by bug in 7.2.1 |
| Date: | 2002-07-02 19:40:21 |
| Message-ID: | 20020702194021.D38FE475E70@postgresql.org |
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| Lists: | pgsql-bugs |
John Liu (johnl(at)emrx(dot)com) reports a bug with a severity of 2
The lower the number the more severe it is.
Short Description
NULLs order by bug in 7.2.1
Long Description
select date_fld from my_table order by date_fld desc;
The above query put NULLs on top of normal values
in stead of bottom, this is not the case in 7.1.3.
I thought Tom made some
fixes on this in 7.2 for order by.
Please provide us a fix patch suggestion
if possible.
Sample Code
No file was uploaded with this report
| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | <johnl(at)emrx(dot)com>, <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: Bug #702: NULLs order by bug in 7.2.1 |
| Date: | 2002-07-03 06:11:17 |
| Message-ID: | 20020702230327.R3117-100000@megazone23.bigpanda.com |
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| Lists: | pgsql-bugs |
On Tue, 2 Jul 2002 pgsql-bugs(at)postgresql(dot)org wrote:
> John Liu (johnl(at)emrx(dot)com) reports a bug with a severity of 2
> The lower the number the more severe it is.
>
> Short Description
> NULLs order by bug in 7.2.1
>
> Long Description
> select date_fld from my_table order by date_fld desc;
>
> The above query put NULLs on top of normal values
> in stead of bottom, this is not the case in 7.1.3.
I think this was the bug fix. I read the applicable
section of the spec as saying that NULLs are treated
as either all greater or all less than non-null values
for order by, so if the nulls come at the end of an asc
order by, they come at the front of the desc one.
| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | johnl(at)emrx(dot)com, pgsql-bugs(at)postgresql(dot)org |
| Subject: | Re: Bug #702: NULLs order by bug in 7.2.1 |
| Date: | 2002-07-03 14:40:07 |
| Message-ID: | 24640.1025707207@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
pgsql-bugs(at)postgresql(dot)org writes:
> select date_fld from my_table order by date_fld desc;
> The above query put NULLs on top of normal values
> in stead of bottom, this is not the case in 7.1.3.
This is not a bug; it is an intentional change in behavior to conform
to SQL92. We are not going to change it back --- unless you can
convince us that our reading of the spec is incorrect.
regards, tom lane