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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
