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CREATE TABLE sutdy( id INT(50) NOT NULL AUTO_INCREMENT, `name` VARCHAR(50) NOT NULL, email VARCHAR(50), PRIMARY KEY(id))ENGINE=INNODB DEFAULT CHARSET=utf8;INSERT INTO `sutdy`(`id`,`name`,`email`)VALUES(1,\'杨开\',\'yangkai@qq.com\'),(2,\'杨开\',\'yangkai@qq.com\'),(3,\'杨开\',\'yangkai@qq.com\'),(4,\'杨开\',\'yangkai@qq.com\'),(5,\'玉如梦\',\'yurumeng@qq.com\'),(6,\'玉如梦\',\'yurumeng@qq.com\'),(7,\'玉如梦\',\'yurumeng@qq.com\'),(8,\'玉如梦\',\'yurumeng@qq.com\'),(9,\'苏颜\',\'suyan@qq.com\'),(10,\'苏颜\',\'suyan@qq.com\'),(11,\'苏颜\',\'suyan@qq.com\'),(12,\'苏颜\',\'suyan@qq.com\'),(13,\'苏颜\',\'suyan@qq.com\'),(14,\'苏颜\',\'suyan@qq.com\'),(15,\'苏颜\',\'suyan@qq.com\'),(16,\'苏颜\',\'suyan@qq.com\'),(17,\'夏凝裳\',\'xianingshagn@qq.com\'),(18,\'夏凝裳\',\'xianingshagn@qq.com\'),(19,\'夏凝裳\',\'xianingshagn@qq.com\'),(20,\'夏凝裳\',\'xianingshagn@qq.com\'),(21,\'夏凝裳\',\'xianingshagn@qq.com\'),(22,\'夏凝裳\',\'xianingshagn@qq.com\'),(23,\'扇轻罗\',\'shanqingluo@qq.com\'),(24,\'扇轻罗\',\'shanqingluo@qq.com\'),(25,\'扇轻罗\',\'shanqingluo@qq.com\'),(26,\'扇轻罗\',\'shanqingluo@qq.com\'),(27,\'扇轻罗\',\'shanqingluo@qq.com\'),(28,\'扇轻罗\',\'shanqingluo@qq.com\'),(29,\'雪月\',\'xueyue@qq.com\'),(30,\'雪月\',\'xueyue@qq.com\'),(31,\'雪月\',\'xueyue@qq.com\'),(32,\'雪月\',\'xueyue@qq.com\'),(33,\'雪月\',\'xueyue@qq.com\'),(34,\'雪月\',\'xueyue@qq.com\'),(35,\'雪月\',\'xueyue@qq.com\'),(36,\'祝情\',\'zhuqing@qq.com\'),(37,\'祝情\',\'zhuqing@qq.com\'),(38,\'祝情\',\'zhuqing@qq.com\'),(39,\'祝情\',\'zhuqing@qq.com\'),(40,\'祝情\',\'zhuqing@qq.com\'),(41,\'祝情\',\'zhuqing@qq.com\'),(42,\'祝情\',\'zhuqing@qq.com\');SELECT email FROM `sutdy` -- 普通查询SELECT DISTINCT `email` FROM `sutdy` -- 去掉重复查询
来源：https://www.cnblogs.com/qingxin123456-dfdsa/p/mysq.html
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