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Results from four tables even when one is empty

Results from four tables even when one is empty

Results from four tables even when one is empty

(OP)
There are four tables, all contain info needed in the result

Subscribers table
---------------------
SubscriberID(PK)
ListID(fK)
Subscribers details


List table
----------------------
LitsID(PK)
List Details


Message table
----------------------
MessageID(PK)
ListID(fK)
Message details


Tracking table
----------------------
SubscriberID(fK)
MessageID(fK)
Tracking details


There needs to be a result set that includes:
Subscriber details
Message details
List details
AND Tracking details (when they are available)

**Where ListID and MessageID are supplied**

Subscribers will always in in a List (with ListID)

If there are subscribers with NO messages sent to them it still needs to return subscribers.

If there are messages sent to that list of subscribers and no tracking yet, then it still needs to display Subscribers (with NULLs for tracking fields)

And when there are tracking results; display all the info
including Tracking details

Any help will be much appreciated
Thanks
Andy

RE: Results from four tables even when one is empty

Look up INNER JOINs and OUTER JOINs in the help doc for your respective platform.

INNER JOINs require that data be in both tables.
OUTER JOINs require that data be in one of the two tables.

Denny
MCSA (2003) / MCDBA (SQL 2000)
MCTS (SQL 2005 / Microsoft Windows SharePoint Services 3.0: Configuration / Microsoft Office SharePoint Server 2007: Configuration)
MCITP Database Administrator (SQL 2005) / Database Developer (SQL 2005)

My Blog

RE: Results from four tables even when one is empty

(OP)
Thanks for that Denny, but I still can't get it to work.
Even if I reduce it to two tables, the second (Tracked) may or may not have a row corresponding to the first (Subscribers) determined by the supplied MessageID and the first tables' SubscriberID

So this does not do the trick:

CODE


SELECT Subscribers.*, tracked.*
FROM Subscribers LEFT OUTER JOIN tracked
ON Subscribers.SubscriberID = tracked.SubscriberID
WHERE Subscribers.ListID = 1 AND tracked.MessageID = 13
I get a list returned that includes only those Subscribers that have entries in the tracked table I guess because of the AND in the WHERE clause

So how can I get it to return all Subscribers plus data from Tracked if there is a row for that SubscriberID and MessageID?

Cheers smile

Andy

RE: Results from four tables even when one is empty

(OP)
Oh I've done it smile

this is how:

CODE

SELECT Lists.ListName, b.campaignID, b.DateOpened, b.CountOpened, b.DateLastOpened AS DLO, a.SubscriberID, a.Name, a.Subscribed, a.Email, a.Format, a.ListID, a.NumClicks, a.MessageLastOpened, a.SubjectMLO
FROM Subscribers a INNER JOIN Lists ON a.ListID = Lists.ListID
LEFT OUTER JOIN (SELECT campaignID, SubscriberID, MessageID, DateOpened, CountOpened, DateLastOpened FROM tracked WHERE MessageID = @messageID) b ON a.SubscriberID = b.SubscriberID
WHERE a.ListID = @listID

I got the ideas from another of your posts Denny - thanks a million
best
Andy

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