sql 如何在MySQL 5.5中将utf8mb4表转换为utf8

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# for Database
ALTER DATABASE databasename CHARACTER SET utf8 COLLATE utf8_unicode_ci;

# for each table
ALTER TABLE tablename CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_commentmeta CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_comments CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_links CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_options CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_postmeta CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_posts CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_termmeta CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_terms CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_term_relationships CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_term_taxonomy CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_usermeta CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;
ALTER TABLE wp_users CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;

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