题目链接:182. 查找重复的电子邮箱 - 力扣(LeetCode)
题目描述 sql语句
方法1:使用临时表
select Email from
(select Email, count(Email) as numfrom Persongroup by Email
) as statistic
where num > 1
;方法2ÿ…
第一个报错:Error: Failed to download metadata for repo docker-ce-stable: Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried
1.进入/etc/yum.repos.d路径下,找到docker-ce.repo文件,把对应 $r…