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mysql修改表、列编码
-- 修改表编码ALTER TABLE `uc_users_bak` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci
-- 修改列编码ALTER TABLE `uc_users_bak` CHANGE `nick_name` `nick_name` VARCHAR( 100 ) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL
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