mysql - 查找 "part"重复内容

Question

如何找到“部分”重复内容？ 我的链接没有正确更新，我留下了两个相似的链接，而不是一个，其中只有子域不同。

例如:

link1: domain-1.com/file_path
links2 domain-2.com/file_path

我想查找 file 列中“file_path”重复的所有链接。

我尝试过的:

SELECT file, COUNT( * ) c
FROM my_table
GROUP BY file HAVING c >1

Answer 1

试试这个:

SELECT COUNT(SUBSTRING_INDEX(file, '.com', -1)) as "c", 
SUBSTRING_INDEX(file, '.com', -1) as "f" 
FROM mytable 
GROUP BY f HAVING c > 1

其中 f 是重复的文件名，c 是出现的次数。

要获取所有链接的列表，您可以尝试:

    SELECT m.file from mytable as "m" 
    WHERE SUBSTRING_INDEX(m.file, '.com', -1) IN (
        SELECT SUBSTRING_INDEX(m2.file, '.com', -1) as "f" 
        FROM mytable as "m2"
        GROUP BY f HAVING COUNT(SUBSTRING_INDEX(m2.file, '.com', -1)) > 1
        )