[SQL] why these results?
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 -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] why these results?
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.kla...@gmail.com -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] why these results?
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 Leeuwenreinou...@n.leeuwen.net http://reinoud.van.leeuwen.net kvk 27320762 __ -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] why these results?
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
