Recently I came across a quick need where I needed to retrieve domain of the email address. The email address is in the database table. I quickly wrote following script which will extract the domain and will also count how many email addresses are there with the same domain address.
SELECT RIGHT(Email, LEN(Email) - CHARINDEX('@', email)) Domain ,
WHERE LEN(Email) > 0
GROUP BY RIGHT(Email, LEN(Email) - CHARINDEX('@', email))
ORDER BY EmailCount DESC
Above script will select the domain after @ character. Please note, if there is more than one @ character in the email, this script will not work as that email address is already invalid.
Do you have any similar script which can do the same thing efficiently? Please post as a comment.
Reference: Pinal Dave (http://blog.SQLAuthority.com)