I faced the problem I only needed to update the data fields with values. When you work with a real app that has a working send email module you don’t want to bother the clients. Just change their email with yours
I spent 10 minutes trying to find the correct query :)
Here it is:
UPDATE USERS SET `email` = CASE WHEN `email`='' or `email` IS NULL THEN "" ELSE "<change>@<address>.com" END;
Don’t forget to change the email address
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