I am having trouble running a query over three tables:
users, user_teams, user_messages
I wish to create a report where a line manager can see the total for incoming mail and outgoing mail for all members of their team. The query is to show zero values for a user if there are no outgoing or incoming.
My tables are as follows:
users
------
uid
forename
surname
user_teams
-------------
id
manager_id
member_id
user_messages
-------------
id
outgoing
incoming
uid
msg_date
Both manager_id and member_id relate to the uid field of users. There is a one to many relationship between managers and users.
My query so far is this:
SELECT u.uid, u.forename, u.surname,
SUM(IF(m.outgoing=0 ,1,0)) AS total_outgoing,
SUM(IF(m.incoming>0 ,1,0)) AS total_incoming,
FROM users u
INNER JOIN user_messages m
ON m.uid=u.uid AND m.msg_date>='2012-09-01' AND m.msg_date<='2013-08-31'
RIGHT JOIN user_teams ut ON ut.member_id=u.uid
WHERE ut.leader_id=?
GROUP BY u.uid
ORDER BY u.surname ASC
This functions correctly if a user has either sent or received a message. However, if the SUM for both fields is zero, I recieve NULL for uid, forename and surname.
