On 4 March 2010 17:26, Terry
<td3201@gmail.com> wrote:
I have 4 tables: dsclient_logs,backup_sets,dsbox,customer. I want a
query that will return all rows from dsclient_logs, insert two columns
from the customer table, and one column from backup_sets. The
relation is this:
dsclient_logs.userid = dsbox.dsbox_snum AND backup_sets.box_id =
dsbox.box_id AND dsbox.account_num = customer.account_num
I originally had this:
SELECT * FROM
(SELECT dsclient_logs.ev_id,dsclient_logs.type,dsclient_logs.ev_time,dsclient_logs.category,dsclient_logs.error,dsclient_logs.ev_text,dsclient_logs.userid,dsclient_logs.ex_long,dsclient_logs.client_ex_long,dsclient_logs.ex_text,dsclient_logs.timestamp,backup_sets.set_name,customer.company_name,customer.account_num
FROM dsclient_logs,dsbox,backup_sets,customer
WHERE dsclient_logs.userid = dsbox.dsbox_snum AND backup_sets.box_id =
dsbox.box_id AND dsbox.account_num = customer.account_num
ORDER BY dsclient_logs.ev_id desc
LIMIT 101) as a
ORDER BY ev_id
In the end, I want a single row for each ev_id that has the
account_num, company_name, and backup_sets filled in. I have a
feeling this needs to be done with a different type of join. Horrible
explanation so I apologize and will gladly redefine my question upon
some feedback.
I think you want an INNER JOIN. This won't match if any 1 table doesn't match on the join.
SELECT dsclient_logs.ev_id,dsclient_
logs.type,dsclient_logs.ev_time,dsclient_logs.category,dsclient_logs.error,dsclient_logs.ev_text,dsclient_logs.userid,dsclient_logs.ex_long,dsclient_logs.client_ex_long,dsclient_logs.ex_text,dsclient_logs.timestamp,backup_sets.set_name,customer.company_name,customer.account_num
FROM dsclient_logs
INNER JOIN dsbox ON dsbox.dsbox_snum = dsclient_logs.userid
INNER JOIN backup_sets ON backup_sets.box_id = dsbox.box_id
INNER JOIN customer ON customer.account_num = dsbox.account_num
ORDER BY dsclient_logs.ev_id desc
If one side can be missing, you'd use a LEFT JOIN. For example, if backup_sets is only sometimes present, and you still want to return data in these instances, just use LEFT JOIN backup_sets.
Regards,
Thom
