Count the number of entries for a given column

Its probably an easy question but hard for me: I have the following table (columns)

 [id, email_from, email_to, email_subject, timestamp]

id and timestamp are numeric and the rest are text fields

for that example:

  [1, john@mail.com, patrick@mail.com, ...]
  [2, john@mail.com, carol@mail.com, ...]
  [3, john@mail.com, john@mail.com, ...]
  [4, john@mail.com, jimmy@mail.com, ...]
  [5, jimmy@mail.com, carol@mail.com, ...]
  [6, jimmy@mail.com, john@mail.com, ...]
  [8, jimmy@mail.com, carol@mail.com, ...]
  [9, carol@mail.com, patrick@mail.com, ...]

I'd like to retrieve the number of mails sent by each user. The result should be like:

[john@mail.com开发者_开发知识库,4]
[jimmy@mail.com,3]
[carol@mail.com,1]

Thanks

select email_from, count(*) from yourtable group by email_from

and possibly adding an

order by count(*) desc

if you want it ordered by most to least emails sent

SELECT email_from, COUNT(email_from) AS 'Count' FROM table_name GROUP BY email_from