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

mike wrote:
>>Try this:
>>
>>SELECT first_name,work_email FROM tb_contacts  WHERE
>>tb_contacts.work_email IS NOT NULL;
>>
>>Or if there are also blanks among those e-mail addresses:
>>
>>SELECT first_name,work_email FROM tb_contacts  WHERE
>>tb_contacts.work_email IS NOT NULL AND tb_contacts.work_email != '';
>>
>
>
> no difference

Then you probably have email addresses that exist of white space only.
You should probably put a constraint on that if undesirable.

Try using a regular expression like so:

SELECT first_name,work_email
FROM tb_contacts
WHERE work_email !~ '^[[:space:]]*$';


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Alban Hertroys
MAG Productions

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