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Help with group by query

Author

Topic

mike123
Master Smack Fu Yak Hacker

1462 Posts

Posted - 2005-02-17 : 19:19:52

I have a table with all my users named "userdetails"

I have a column named "emailaddress" that stores the users email address.

I want to find out the most popular email service providers, for example - hotmail, gmail, yahoo etc...

How can I write a query that will do this ?

My desired results would look something like this ..

hotmail.com / 2234
gmail.com / 2334
yahoo.com / 3222

Thanks alot for any help!
mike123

ehorn
Master Smack Fu Yak Hacker

1632 Posts

Posted - 2005-02-17 : 19:24:02

Maybe something like:

select domain, count(domain)
from
(
select substring(emailaddress, charindex('@',emailaddress,1)+1,len(emailaddress)) domain
from userdetails
) d
group by domain

mike123
Master Smack Fu Yak Hacker

1462 Posts

Posted - 2005-02-17 : 19:26:44

Ehorn,

Thanks very much! worked perfectly !

mike123

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2005-02-17 : 19:27:58

Here's what I came up with:


SELECT 
	SUBSTRING(emailaddress, CHARINDEX('@', emailaddress) + 1, DATALENGTH(emailaddress)) AS Domain, 
	COUNT(emailaddress) AS DomainCount
FROM @userdetails
GROUP BY SUBSTRING(emailaddress, CHARINDEX('@', emailaddress) + 1, DATALENGTH(emailaddress))
ORDER BY DomainCount DESC

Tara

mike123
Master Smack Fu Yak Hacker

1462 Posts

Posted - 2005-02-17 : 19:35:45

thanks tara, that worked great too! .. you guys are way too quick today lol

mike123

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