显示出现多次的修改后的字符串

Question

我得到一个查询，该查询会切断每行的域后缀，例如google.com-> google或google.co.uk-> google

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，我想显示所有出现多次的所有修改域。 我怎样才能做到这一点？ 谢谢你的协助 ;）

Answer 1

只需添加

GROUP BY Keydomain
HAVING COUNT(*) > 1

您的查询。

编辑：

您能否告诉我是否有一种方法可以将您添加的所有域名一一列出？

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