RE: NULL value

Hey, I just learned this yesterday :-)

Null-values are neverd stored in indexes, and will not trigger a constraint like UNIQUE ...
So, I suppose NULL is not a value, so what is it. It's like asking : what is nothing ... :-)

> -----Original Message-----
> From: awaisb_at_paktel.com [SMTP:awaisb_at_paktel.com]
> Sent: Tuesday, October 10, 2000 12:26 PM
> To: Multiple recipients of list ORACLE-L
> Subject: NULL value
>
> Hi,
> I have a logical question, any one who can make it clear.
> create table a (x number(2) unique);
> insert into a values (null);
> 1 row created.
> insert into a values (null);
> 1 row created.
> Q:- I have a table 'A' have one field 'X' with unique constraint, so a
> unique index will be created for it. I inserted null into this field two
> times (or more then it).
>
> If null is a value, Why these null stored into table which have unique
> constraint?
> If null is not a VALUE then what it is?
> Is there some special character for NULL?
> If null is not a value why we have operators for null?
>
> Regards
>
> Muhammad Awais
> System Developer
> Paktel Ltd. Pakistan
> Mob. 0303 7757077
> (92-51) 111-222-111-282
>
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Received on Tue Oct 10 2000 - 06:42:54 CDT