Frankly, this question has little or nothing to do with Perl

However, I will say one thing and that is it sounds like you need to rethink your db schema. Perhaps you should have a seperate table that is indexed by email with an id that is a foreign key in the current table you are referencing. It will make tasks like this easier and your database much more efficent.

If you are not familiar with database normalization, I recommend you find out more about it. I don't have a URL to point your to but I am sure google will have plenty.

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I admit it, I am Paco.