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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,'楊開','[email protected]'),(2,'楊開','[email protected]'),(3,'楊開','[email protected]'),(4,'楊開','[email protected]'),(5,'玉如夢','[email protected]'),(6,'玉如夢','[email protected]'),(7,'玉如夢','[email protected]'),(8,'玉如夢','[email protected]'),(9,'蘇顏','[email protected]'),(10,'蘇顏','[email protected]'),(11,'蘇顏','[email protected]'),(12,'蘇顏','[email protected]'),(13,'蘇顏','[email protected]'),(14,'蘇顏','[email protected]'),(15,'蘇顏','[email protected]'),(16,'蘇顏','[email protected]'),(17,'夏凝裳','[email protected]'),(18,'夏凝裳','[email protected]'),(19,'夏凝裳','[email protected]'),(20,'夏凝裳','[email protected]'),(21,'夏凝裳','[email protected]'),(22,'夏凝裳','[email protected]'),(23,'扇輕羅','[email protected]'),(24,'扇輕羅','[email protected]'),(25,'扇輕羅','[email protected]'),(26,'扇輕羅','[email protected]'),(27,'扇輕羅','[email protected]'),(28,'扇輕羅','[email protected]'),(29,'雪月','[email protected]'),(30,'雪月','[email protected]'),(31,'雪月','[email protected]'),(32,'雪月','[email protected]'),(33,'雪月','[email protected]'),(34,'雪月','[email protected]'),(35,'雪月','[email protected]'),(36,'祝情','[email protected]'),(37,'祝情','[email protected]'),(38,'祝情','[email protected]'),(39,'祝情','[email protected]'),(40,'祝情','[email protected]'),(41,'祝情','[email protected]'),(42,'祝情','[email protected]');
SELECT email FROM `sutdy` -- 普通查詢
SELECT DISTINCT `email` FROM `sutdy` -- 去掉重復查詢
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標籤：MySQL
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