mysql在表中添加多個外鍵/增長外鍵/級聯約束

建表時建立外鍵： CREATE TABLE`xh` ( `id` int(100) unsigned NOT NULL AUTO_INCREMENT COMMENT , `cl_id` smallint(3) unsigned NOT NULL COMMENT, `title` varchar(100) COLLATE utf8_unicode_ci NOT NULL COMMENT , `det

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