Re: When is a blank not a null or ''

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От Michael Kleiser
Тема Re: When is a blank not a null or ''
Дата
Msg-id 4200B74B.4090900@webde-ag.de
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Ответ на When is a blank not a null or ''  (mike <mike@redtux1.uklinux.net>)
Ответы Re: When is a blank not a null or ''  ("Berend Tober" <btober@computer.org>)
Список pgsql-general
mike wrote:
I have the following query (I have removed all nulls from the field as
test)

SELECT first_name,work_email FROM tb_contacts  WHERE
tb_contacts.work_email <>'';

However I get loads of blank email addresses coming up

anyone any ideas

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Are NULL in work_email possible ?
If yes you should you have to use.

SELECT first_name,work_email FROM tb_contacts  WHERE tb_contacts.work_email <>''
AND  tb_contacts.work_email IS NOT NULL;

By the was in Oracle there is no difference between empty
CHAR- or VARCHAR-column and NULL- CHAR or VARCHAR-columns.
But that is scpecial to Oracle.


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