显示多次出现的修改后的字符串

Question

我收到了一个查询，它会切断每一行的域名后缀，例如： google.com - ＆gt; google或google.co.uk - ＆gt;谷歌

查询如下

SELECT id,domain, 
CASE 
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 1 THEN REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 2 THEN REVERSE(SUBSTRING(REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))), LOCATE('.', REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000)))) + 1, 1000))

END as Keydomain
FROM sites

现在我想显示多次出现的所有修改过的域名。我怎样才能做到这一点？谢谢你帮助我;）

Answer 1

添加

GROUP BY Keydomain
HAVING COUNT(*) > 1

查询。

修改

  

您能否告诉我是否有办法逐个列出完整的域名？

SELECT * FROM
(
SELECT 
CASE 
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 1 THEN REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 2 THEN REVERSE(SUBSTRING(REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))), LOCATE('.', REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000)))) + 1, 1000))
END as Keydomain
FROM sites
GROUP BY Keydomain
HAVING COUNT(*) > 1
) d1
INNER JOIN
(
SELECT id, domain,
CASE 
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 1 THEN REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))
WHEN LENGTH(domain) - LENGTH(REPLACE(domain, '.', '')) = 2 THEN REVERSE(SUBSTRING(REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000))), LOCATE('.', REVERSE(REVERSE(SUBSTRING(REVERSE(domain), LOCATE('.', REVERSE(domain)) + 1, 1000)))) + 1, 1000))
END as Keydomain
FROM sites
) d2
ON d1.Keydomain = d2.Keydomain