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N!ck	03-11-2002 02:04 AM

JOINing a count?

How do I join a count from another table? I want to list all users and to see how many photos (stored in a separate table) a particular user has submitted. Can someone show me the MySQL syntax? Thanks!

N!ck	03-16-2002 01:49 AM

someone?

Freddie Bingham

03-16-2002 02:52 AM

something like:

SELECT count(*) as total
FROM user, photos
WHERE user.userid=photo.userid
GROUP BY photo.userid

N!ck	03-16-2002 10:03 PM

okay...thanks! :)

N!ck	03-16-2002 10:46 PM

errrr...how can i merge this with a regular query to list all the users?

N!ck	03-17-2002 06:01 AM

yeah so it freddie or someone could show me an example of how to list all members and for each one show how many photos they have in a table called "userphotos", i would very much appreciate it :D thanks

Freddie Bingham

03-17-2002 08:29 AM

This would only list those with at least one photo

SELECT count(*) as total , user.username
FROM user, photos
WHERE user.userid=photo.userid
GROUP BY photo.userid

or this would show all users, putting 0 for those with none.

SELECT count(*) as total , user.username
FROM user
LEFT JOIN photos USING (userid)
GROUP BY photo.userid

N!ck	03-17-2002 01:55 PM

can you show me how to use that in a php script? lol

wooolF[RM]

03-17-2002 02:00 PM

]

Code:

<?

SELECT count(*) as total , user.username 

FROM user, photos 

WHERE user.userid=photo.userid 

GROUP BY photo.userid

?>

Code:

<?

SELECT count(*) as total , user.username 

FROM user 

LEFT JOIN photos USING (userid) 

GROUP BY photo.userid

?>

PS: I'm not 100% sure about it...

N!ck	03-17-2002 02:01 PM

never mind! i see it now!

N!ck	03-17-2002 02:13 PM

my problem now is that it only lists MY name!

the query:

Code:

SELECT COUNT(id) AS total, user.userid, user.username FROM user LEFT JOIN userphotos USING (userid) GROUP BY userphotos.userid ORDER BY user.usergroupid DESC, user.username LIMIT $offset, 15

($offset is set via a query string, or else it equals zero)

and also, i did COUNT(id) because id exists in the userphotos table and not in the user table.

wooolF[RM]

03-17-2002 02:20 PM

]sry... can't help you... :(

Freddie Bingham

03-17-2002 05:19 PM

try

GROUP BY user.userid instead of GROUP BY userphotos.userid

using COUNT(*) is faster than using COUNT(id)

N!ck	03-17-2002 05:54 PM

k thanks again :)

N!ck	03-17-2002 05:56 PM

okay, better...but now it outputs "1" instead of "0" (nobody has posted any pics yet, but they all have 1's next their names)

Freddie Bingham

03-17-2002 08:37 PM

Try this

Code:

SELECT user.userid, user.username, count(userphotos.userid) AS total

FROM user

LEFT JOIN userphoto ON (userphoto.userid=user.userid)

GROUP BY user.userid

ORDER BY user.usergroupid DESC, user.username

LIMIT $offset, 15

This would give you then number of attachments each user has as I verified it. Since the above follows the same logic, it has to work.:

Code:

SELECT user.userid, user.username, count(attachment.userid) as attachmentcount

FROM user

LEFT JOIN attachment ON (user.userid=attachment.userid)

GROUP BY user.userid

N!ck	03-17-2002 08:45 PM

yes it appears to work just fine. thanks so much.

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