SQL - 获取表一的所有行和行数

【问题标题】：SQL - Get all rows of table one and count of rowsSQL - 获取表一的所有行和行数
【发布时间】：2017-10-01 09:25:51
【问题描述】：

如何创建一个 SQL 查询来获取表中的所有行以及在电子邮件下插入的行数？

我尝试了类似的方法，但是这会将行分组，所以我没有得到所有的行。

SELECT *, COUNT(email) AS 'count' FROM adverts GROUP BY email

【问题讨论】：

【解决方案1】：

select a1.*, a2.count
from adverts a1
join
(
  SELECT email, COUNT(*) AS 'count' 
  FROM adverts 
  GROUP BY email
) a2 on a1.email = a2.email

【讨论】：

【解决方案2】：

试试这个，

select *,
    (select count(Email) 
    from adverts  where adverts.Email =a.Email) as EmailCount
    from adverts as a

或者这个

SELECT *, COUNT(email) OVER (PARTITION BY  email) as EmailCount FROM adverts

【讨论】：