Fw: Null and Not Null
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Тема | Fw: Null and Not Null |
Дата | |
Msg-id | 007901c06f5c$a88f1e80$0402010a@Vectormath обсуждение исходный текст |
Список | pgsql-novice |
Immediately after sending this I realized that through a very unfortunate coincidence this message could be read as containing rather sarcastic humor. It was not intended. David Boerwinkle ----- Original Message ----- From: <davidb@vectormath.com> To: Mike Hammonds <mhammonds@knowledgeinenergy.com>; <pgsql-novice@postgresql.org> Sent: Tuesday, December 26, 2000 10:51 AM Subject: Re: [NOVICE] Null and Not Null > Hi Mike, > > Your question is sort of broad. Could you be more specific? > > However, a general reply to your broad question (and a source of confusion > for many people) is that Null does not mean "empty", rather it means > "undefined" (as in "the answer to a poorly formed question") -- which is why > Null = Null is false. > > Thanks, > David Boerwinkle > > ----- Original Message ----- > From: Mike Hammonds <mhammonds@knowledgeinenergy.com> > To: <pgsql-novice@postgresql.org> > Sent: Tuesday, December 26, 2000 9:43 AM > Subject: [NOVICE] Null and Not Null > > > ** Reply Requested When Convenient ** > > Can some one please help me understand Null and Not Null > > Thanks > > Mike Hammonds, CNE5, MCP-NT > Fellon-McCord & Associates, Inc. > Office: 502.214-6324 > Fax: 502.426.8800 > mhammonds@knowledgeinenergy.com > Show Me the Code!! > > >
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