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Mysql Puede ser solamente un campo automatico y este debe ser definido como una clave

 -- ---------------------------- -- Table structure for `prefix_admintools_badwords` -- ---------------------------- DROP TABLE IF EXISTS `prefix_admintools_badwords`; CREATE TABLE `prefix_admintools_badwords` ( `id`  bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT , `word`  varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL , PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARACTER SET=utf8 COLLATE=utf8_general_ci AUTO_INCREMENT=1

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