Question

我已成功在phpmyadmin中选择重复查询，如下所示

SELECT *, COUNT(ID)
FROM LINKS
GROUP BY URL
HAVING COUNT( ID ) >1

现在，我需要删除具有重复条目的相同条目，我需要为获取的查询运行什么查询。在删除之前，我想确保我正在运行正确的。提前致谢

Answer 1

查看此fiddle。此查询也有效，并保留ID最少的行...

DELETE L1
FROM LINKS L1
    JOIN LINKS L2 ON L1.URL = L2.URL
WHERE L1.ID > L2.ID

Answer 2

检查：

https://coderwall.com/p/pypbpw?i=4&p=1&q=author%3Amorteza-ipo&t%5B%5D=morteza-ipo

以下是如何删除MySQL中重复行的示例。

DROP FUNCTION IF EXISTS removeDuplicates;
DELIMITER $$
CREATE FUNCTION removeDuplicates(x int)
    RETURNS TINYINT
    BEGIN
        DECLARE x int;
        SET x = x;
        REPEAT

            DELETE FROM `my-queue` WHERE id IN 
            (
                SELECT id FROM 
                (
                    SELECT id, COUNT( * ) AS c,  `to` ,  `msg` 
                    FROM  `my-queue` 
                    GROUP BY  `to` ,  `msg` 
                    HAVING c >1
                ) as tem1
            );

            SET x = x - 1; 
        UNTIL x < 1 END REPEAT;
        RETURN 1;
    END $$
DELIMITER ;

请致电：

select removeDuplicates(100);

祝你好运

删除重复条目

2 个答案: