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Duplicate GROUP_CONCAT values

Writing a plugin for Wordpress using a custom post type and an additional alias table to hold repetition of the post events. The problem comes with duplicate post meta values. wp_post_meta table: ...
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How can I join one to one to (many to one) without using group_concat

I have a table structure as follows: -- -- Table structure for table `emails` -- CREATE TABLE IF NOT EXISTS `emails` ( `ID` int(5) NOT NULL AUTO_INCREMENT, `email` varchar(255) COLLATE ...