我有一张这样的桌子
mysql> desc user_changes;
+----------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| id | varchar(16) | NO | PRI | | |
| email | varchar(255) | YES | MUL | NULL | |
| products | longtext | YES | | NULL | |
+----------+--------------+------+-----+---------+-------+
3 rows in set (0.00 sec)
我需要创建一个查询来计算通过电子邮件发送的所有重复项,如下所示
| 20061129180346 | tes[email protected] /cdn-cgi/l/email-protection | 1^31^9
| 20061129330638 | [email protected] /cdn-cgi/l/email-protection | 1^31^9
SELECT count(*), email
FROM user_changes
GROUP BY email
HAVING count(*) > 1
最后 (HAVING
) 子句将选择范围限制为大于 1 的电子邮件计数,例如重复。
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