>>anyone any ideas
> 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;
>

See what happens with

SELECT first_name, work_email, LENGTH(COALESCE(work_email, ''))
FROM tb_contacts
WHERE LENGTH(TRIM(COALESCE(work_email, ''))) = 0


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