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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
Original: https://www.cnblogs.com/qingxin123456-dfdsa/p/mysq.html
Author: 唐幽幽
Title: MySQL DQL 去重教程表代码
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