Re: Adding UNIQUE constraint on NULL column

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От Frank D. Engel, Jr.
Тема Re: Adding UNIQUE constraint on NULL column
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Msg-id A13B51F0-65AB-11D9-8A04-0050E410655F@fjrhome.net
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Ответ на Re: Adding UNIQUE constraint on NULL column  (Scott Marlowe <smarlowe@g2switchworks.com>)
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Or look at:

http://archives.postgresql.org/pgsql-sql/2003-08/msg00286.php

(and possibly its follow-up)

On Jan 13, 2005, at 3:16 PM, Scott Marlowe wrote:

> On Thu, 2005-01-13 at 11:02, Doug McNaught wrote:
>> Dave Smith <dave.smith@candata.com> writes:
>>
>>> On Thu, 2005-01-13 at 10:12, Doug McNaught wrote:
>>
>>>> Are you really saying that you want 'NULL = NULL' to return 't'?
>>
>>> Yes
>>
>> Well, that's not how NULL works.
>
> In this instance, just create an artificial NULL, like a text string of
> "NONE" and insert that.
>
>
>
> ---------------------------(end of
> broadcast)---------------------------
> TIP 5: Have you checked our extensive FAQ?
>
>                http://www.postgresql.org/docs/faqs/FAQ.html
>
>
- -----------------------------------------------------------
Frank D. Engel, Jr.  <fde101@fjrhome.net>

$ ln -s /usr/share/kjvbible /usr/manual
$ true | cat /usr/manual | grep "John 3:16"
John 3:16 For God so loved the world, that he gave his only begotten
Son, that whosoever believeth in him should not perish, but have
everlasting life.
$
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