如何计算MySQL中列值的出现次数？

Question

my Query :

SELECT 
 max(if(`field_name`='your-name', `field_value`, null )) AS 'Name',
 max(if(`field_name`='your-email', `field_value`, null )) AS 'email',
 max(if(`field_name`='your-subject', `field_value`, null )) AS 'subject'


FROM Complaints 
WHERE `form_name` = 'Complaint'  
GROUP BY `submit_time`;

and the table look like that

+---------+---------------+---------+
|  Name   |     email     | Subject |
+---------+---------------+---------+
| Mike AA | test@test.com | test    |
| John    | a@test.com    | w       |
| Mike AA | test@test.com | zzzz    |
+---------+---------------+---------+

I am trying to add new column for count where value name is the same so to be like this. group records where "Name is the same"

+---------+---------------+---------+---------------------+
|  Name   |     email     | Subject | Number of Complaint |
+---------+---------------+---------+---------------------+
| Mike AA | test@test.com | test    |                   2 |
| John    | a@test.com    | w       |                   1 |
+---------+---------------+---------+---------------------+

Thank you so much for your help

Answer 1

Is this what you are looking for?

SELECT name, email, min(Subject) as Subject, count(*) as NumComplaint
FROM `contactus`  c
WHERE `form_name` = 'Complaint'  
GROUP BY name, email;