SQL-获取表一的所有行和行数

Question

如何创建一个SQL查询，该查询获取表的所有行以及在电子邮件下插入的行数？

我尝试过类似的操作，但是将行分组，所以我没有得到所有行。

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

Answer 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

Answer 2

尝试这个，

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

或这个

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