SQL-獲取表一的所有行和行數

Question

如何創建一個SQL查詢，該查詢獲取表的所有行以及在電子郵件下插入的行數？

我嘗試過類似的操作，但是將行分組，所以我沒有得到所有行。

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

嘗試這個，

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

或這個

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