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mysql数据库建表问题，在线急等

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Release： 2016-06-06 09:41:36
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mysql数据库

数据库建表这3个语句是什么意思？后两个有什么区别？

（1）PRIMARY KEY (ID) USING BTREE

（2）ENGINE=InnoDB DEFAULT CHARSET=gb2312;

（3）ENGINE = InnoDB
CHARACTER SET gb2312 COLLATE gb2312_chinese_ci;

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mysql 数据库
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