Dang, you're right--I just now tested it. I knew that MY_COL = NULL isn't
evaluable--I'm not sure why I thought IN() would act differently.
I guess it would be whiny of me to wish that I'd get a warning or error from
the db when issuing such statements...
Thanks!
-Roy
Roy Pardee
Programmer/Analyst
SWFPAC Lockheed Martin IT
Extension 8487
-----Original Message-----
Sent: Monday, May 06, 2002 10:26 AM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Yes, that's what it means.
Using NULL in IN() would imply that NULL has equality with something.
NULL is never equal to anything. NULL can only be checked with
'IS NULL' , 'IS NOT NULL', and in DECODE() statements.
Jared
"Pardee, Roy E" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
05/06/2002 09:53 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
cc:
Subject: RE: IN() question
Does this mean that you can't include Null as a value in an IN() clause?
That is, would something like:
> SQL> SELECT COUNT(*)
> 2 from leisure_plan_master_temp
> 3 where membership_class = 'D'
> 4 AND pay_METHOD IN (Null, 'C','P');
count rows where pay_METHOD is Null? (Disregarding for the moment the
problem Lisa was actually trying to solve.)
Thanks!
-Roy
Roy Pardee
Programmer/Analyst
SWFPAC Lockheed Martin IT
Extension 8487
-----Original Message-----
Sent: Friday, May 03, 2002 5:33 PM
To: Multiple recipients of list ORACLE-L
In any equivalence operation (which includes non-equivalence, too), NULL
never returns TRUE -- it just returns NULL which non-TRUE has the same
result as FALSE. Only IS and IS NOT operators can be used to evaluate
NULLs...
----- Original Message -----
To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]>
Sent: Friday, May 03, 2002 5:43 PM
> Slap me if this is a dumb question.
>
> Here's my pay methods
>
> SQL> SELECT ASCII(PAY_METHOD), PAY_METHOD, COUNT(*)
> 2 FROM LEISURE_PLAN_MASTER_TEMP
> 3 WHERE MEMBERSHIP_CLASS = 'D'
> 4 GROUP BY PAY_METHOD;
>
> ASCII(PAY_METHOD) P COUNT(*)
> ----------------- - ----------
> 67 C 42955
> 80 P 34373
> 11786
>
> I expected this statement to return the 11,786 records that have null
> values. However, it doesn't:
>
> SQL> SELECT COUNT(*)
> 2 from leisure_plan_master_temp
> 3 where membership_class = 'D'
> 4 AND pay_METHOD NOT IN ('C','P');
>
> COUNT(*)
> ----------
> 0
>
> But when I do this, I get the answer I expect.
>
> SQL> SELECT COUNT(*)
> 2 from leisure_plan_master_temp
> 3 where membership_class = 'D'
> 4 AND PAY_METHOD IS NULL;
>
> COUNT(*)
> ----------
> 11786
>
> This isn't exactly correct. There may be other values in this field,
and
if
> they show up I need to include them, not just records where this field
is
> null. What am I missing? Is it because the value is NULL that Oracle
> excludes it from the IN() statement, because of the classic definition
of
> NULL (can't be defined, therefore can't be sure it's not a C or a P)?
>
> This is easy enough to fix, I'll change my data load to populate the
null
> values with my own code. But still? Have I got the WHY correct?
>
> Thanks for any light someone can shed on this stupid question.
>
> Lisa Koivu
> Oracle Database Monkey Mama
> Fairfield Resorts, Inc.
> 5259 Coconut Creek Parkway
> Ft. Lauderdale, FL, USA 33063
>
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> --
> Author: Koivu, Lisa
> INET: [EMAIL PROTECTED]
>
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