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* why these results?
@ 2011-08-01 22:50 Wes James <comptekki@gmail.com>
0 siblings, 3 replies; 5+ messages in thread
From: Wes James @ 2011-08-01 22:50 UTC (permalink / raw)
To: pgsql-sql
select count(*) from table;
count
-------
100
(1 row)
is correct
select count(*) from table where col::text ~~* '%text%';
count
-------
1
(1 row)
is correct.
But now if I do:
select count(*) from table where col::text !~~* '%text%';
count
-------
98
(1 row)
Shouldn't it be 99? That is out of 100 records there is one that has
"text" in column "col" so the !~~* should return 99 rows. ??
-wes
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: why these results?
@ 2011-08-01 23:00 Adrian Klaver <adrian.klaver@gmail.com>
parent: Wes James <comptekki@gmail.com>
2 siblings, 0 replies; 5+ messages in thread
From: Adrian Klaver @ 2011-08-01 23:00 UTC (permalink / raw)
To: pgsql-sql; +Cc: Wes James <comptekki@gmail.com>
On Monday, August 01, 2011 3:50:00 pm Wes James wrote:
> select count(*) from table;
>
> count
> -------
> 100
> (1 row)
>
>
> is correct
>
> select count(*) from table where col::text ~~* '%text%';
>
> count
> -------
> 1
> (1 row)
>
> is correct.
>
> But now if I do:
>
>
> select count(*) from table where col::text !~~* '%text%';
> count
> -------
> 98
> (1 row)
>
> Shouldn't it be 99? That is out of 100 records there is one that has
> "text" in column "col" so the !~~* should return 99 rows. ??
NULL value in field?
>
> -wes
--
Adrian Klaver
adrian.klaver@gmail.com
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: why these results?
@ 2011-08-01 23:01 Reinoud van Leeuwen <reinoud.v@n.leeuwen.net>
parent: Wes James <comptekki@gmail.com>
2 siblings, 0 replies; 5+ messages in thread
From: Reinoud van Leeuwen @ 2011-08-01 23:01 UTC (permalink / raw)
To: pgsql-sql
On Mon, Aug 01, 2011 at 04:50:00PM -0600, Wes James wrote:
> select count(*) from table;
>
> count
> -------
> 100
> (1 row)
>
>
> is correct
>
> select count(*) from table where col::text ~~* '%text%';
>
> count
> -------
> 1
> (1 row)
>
> is correct.
>
> But now if I do:
>
>
> select count(*) from table where col::text !~~* '%text%';
> count
> -------
> 98
> (1 row)
>
> Shouldn't it be 99? That is out of 100 records there is one that has
> "text" in column "col" so the !~~* should return 99 rows. ??
Wild guess:
select count (*) from table where col is null;
count
------
1
(1 row)
";-)
Reinoud
--
__________________________________________________
"Nothing is as subjective as reality"
Reinoud van Leeuwen reinoud.v@n.leeuwen.net
http://reinoud.van.leeuwen.net kvk 27320762
__________________________________________________
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: why these results?
@ 2011-08-01 23:01 Steve Crawford <scrawford@pinpointresearch.com>
parent: Wes James <comptekki@gmail.com>
2 siblings, 1 reply; 5+ messages in thread
From: Steve Crawford @ 2011-08-01 23:01 UTC (permalink / raw)
To: pgsql-sql
On 08/01/2011 03:50 PM, Wes James wrote:
> select count(*) from table;
>
> count
> -------
> 100
> (1 row)
>
>
> is correct
>
> select count(*) from table where col::text ~~* '%text%';
>
> count
> -------
> 1
> (1 row)
>
> is correct.
>
> But now if I do:
>
>
> select count(*) from table where col::text !~~* '%text%';
> count
> -------
> 98
> (1 row)
>
> Shouldn't it be 99? That is out of 100 records there is one that has
> "text" in column "col" so the !~~* should return 99 rows. ??
>
> -wes
>
select count(*) from table where col is null;
(null is neither equal nor not-equal to anything, even null)
Cheers,
Steve
^ permalink raw reply [nested|flat] 5+ messages in thread
* Re: why these results?
@ 2011-08-02 14:13 Wes James <comptekki@gmail.com>
parent: Steve Crawford <scrawford@pinpointresearch.com>
0 siblings, 0 replies; 5+ messages in thread
From: Wes James @ 2011-08-02 14:13 UTC (permalink / raw)
To: pgsql-sql
Yes. Thanks to all that responded. That was it.
-wes
On Mon, Aug 1, 2011 at 5:01 PM, Steve Crawford
<scrawford@pinpointresearch.com> wrote:
> On 08/01/2011 03:50 PM, Wes James wrote:
>>
>> select count(*) from table;
>>
>> count
>> -------
>> 100
>> (1 row)
>>
>>
>> is correct
>>
>> select count(*) from table where col::text ~~* '%text%';
>>
>> count
>> -------
>> 1
>> (1 row)
>>
>> is correct.
>>
>> But now if I do:
>>
>>
>> select count(*) from table where col::text !~~* '%text%';
>> count
>> -------
>> 98
>> (1 row)
>>
>> Shouldn't it be 99? That is out of 100 records there is one that has
>> "text" in column "col" so the !~~* should return 99 rows. ??
>>
>> -wes
>>
> select count(*) from table where col is null;
>
> (null is neither equal nor not-equal to anything, even null)
>
> Cheers,
> Steve
>
> --
> Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-sql
>
^ permalink raw reply [nested|flat] 5+ messages in thread
end of thread, other threads:[~2011-08-02 14:13 UTC | newest]
Thread overview: 5+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2011-08-01 22:50 why these results? Wes James <comptekki@gmail.com>
2011-08-01 23:00 ` Adrian Klaver <adrian.klaver@gmail.com>
2011-08-01 23:01 ` Reinoud van Leeuwen <reinoud.v@n.leeuwen.net>
2011-08-01 23:01 ` Steve Crawford <scrawford@pinpointresearch.com>
2011-08-02 14:13 ` Wes James <comptekki@gmail.com>
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