How Do I Merge Categories With phpMyAdmin

You can’t simply “merge categories” you have to change the category that each post is associated with. The table WP_TERM_RELATIONSHIPS links posts with categories. You could try something like this:

UPDATE wp_term_relationships 
SET term_taxonomy_id = 
   (SELECT term_taxonomy_id FROM wp_term_taxonomy WHERE term_id = 112748)
WHERE term_taxonomy_id =
   (SELECT term_taxonomy_id FROM wp_term_taxonomy WHERE term_id = 112747)

You might also try this plugin: http://wordpress.org/plugins/batchmove/

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