MySQL Query to Count Unique Domains from Email Address field

Question

I'd like to get a better idea of what domains my customers are using. I could easily do this in PHP by explodeing each address and counting the domain that way. But I'm wondering if there's a way to get this information with just a plain MySQL query?

This is what sample output would look like:

gmail.com | 3942

yahoo.com | 3852

hotmail.com | 209

... and so on, where the first column is the email addresses domain, and the 2nd column is the number of addresses at that domain.

Answer 1

How about something like

SELECT COUNT(DISTINCT [what you want])
FROM MyTable

COUNT(DISTINCT expr,[expr...])

Answer 2

You would have to do something like this:

SELECT substring_index(email, '@', -1), COUNT(*)
FROM table
GROUP BY substring_index(email, '@', -1);