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[我有一個表用戶,有一個唯一的鍵用於創建5列唯一的密鑰(USER_NAME-EMAIL_ID-DOB-phone_no地址)。]查找數據庫中的重複行如果唯一鍵(col1-col2-col3-col4-col5)通過使用5列,使用默認空值的第五列構建
CREATE TABLE `users` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`user_name` VARCHAR(50) NOT NULL DEFAULT '0' COLLATE 'utf8_bin',
`email_id` VARCHAR(50) NOT NULL DEFAULT '0' COLLATE 'utf8_bin',
`dob` DATE NOT NULL,
`phone_no` BIGINT(20) NOT NULL DEFAULT '0',
`address` VARCHAR(25) NULL DEFAULT NULL COLLATE 'utf8_bin',
PRIMARY KEY (`id`),
UNIQUE INDEX `user_name` (`dob`, `address`, `phone_no`, `user_name`, `email_id`)
)
COLLATE='utf8_bin'
ENGINE=MyISAM
AUTO_INCREMENT=13
;
如表用戶上傳早些時候批量數據通過csv文件使用忽略重複選項。並在列地址插入空值的數據,
現在我想檢查我的用戶表中重複的唯一鍵數據。
id|user_name|email_id|dob|phone_no|address|
1|roy|[email protected]|42768|9992223|null|
2|roy|[email protected]|42768|9992223|null|
3|roy|[email protected]|42768|9992223|null|
4|roy|[email protected]|42768|9992223|null|
5|roy|[email protected]|42768|9992223|null|
6|roy|[email protected]|42768|9992223|null|
7|me|[email protected]|42797|7897897899|null|
8|me|[email protected]|42798|7897897900|null|
9|me|[email protected]|42799|7897897901|null|
10|me|[email protected]|42800|7897897902|null|
11|st|[email protected]|42495|1122121212|null|
12|mr|[email protected]|42129|141414|null|
13|mr|[email protected]|42129|141414|null|
14|mr|[email protected]|42129|141414|null|
15|mr|[email protected]|42129|141414|null|
16|mr|[email protected]|42129|141414|null|
17|mr|[email protected]|42129|141414|null|
18|mr|[email protected]|42129|141414|null|
19|mr|[email protected]|42129|141414|null|
20|mr|[email protected]|42129|141414|null|
獨特的關鍵數據永遠不會有重複 –
[答案這裏分貝不可知(http://stackoverflow.com/questions/2112618/finding-duplicate -rows式-SQL服務器)。大概你也[想刪除行](http://stackoverflow.com/questions/3311903/remove-duplicate-rows-in-mysql) –
@AksheyBhat如果要強制插入數據,我會插入 –