mysql 修改表、列编码

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-- 修改表编码
ALTER TABLE? `uc_users_bak` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci

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-- 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