MySQL
From Wikicliki
ALTER TABLE `wp_comments` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_links` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_options` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_postmeta` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_posts` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_terms` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_term_relationships` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_term_taxonomy` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_usermeta` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ; ALTER TABLE `wp_users` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci ;