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 Left Outer Join

Author  Topic 

swatib
Posting Yak Master

173 Posts

Posted - 2006-01-24 : 06:10:52

For a report, I'm writing a query. I'm retrieving data from more than one child views. All the child views have common ID field- AgentID.

The query is like this-

SELECT L.AgentID, LoggedInTime, NotReadyTime, RingTime, HoldTime, IdleTime, CallsPresented,
CallsAnswered, CallsConference, CallsTransfered
FROM Vw_LoggedInTime L LEFT OUTER JOIN Vw_NotReadyTime N ON L.AgentID=N.AgentID
LEFT OUTER JOIN Vw_RingTime R ON N.AgentID=R.AgentID
LEFT OUTER JOIN Vw_HoldTime H ON R.AgentID=H.AgentID
LEFT OUTER JOIN Vw_IdleTime I ON H.AgentID=I.AgentID
LEFT OUTER JOIN Vw_CallAnswered A ON I.AgentID=A.AgentID
LEFT OUTER JOIN Vw_CallConference C ON A.AgentID=C.AgentID
LEFT OUTER JOIN Vw_CallTransfered T ON C.AgentID=T.AgentID

I want data for all agents where the child views may or may not have the data.
The above query is working but since the view Vw_RingTime can't have the record for a agent, the data from Vw_IdleTime is not displaying in the result.
Plz give me proper way to the solution.

Njoy Life

spirit1
Cybernetic Yak Master

11752 Posts

Posted - 2006-01-24 : 06:24:36
join it to another table...

so what do you join Vw_RingTime on if it doesn't have agentID?

Go with the flow & have fun! Else fight the flow
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swatib
Posting Yak Master

173 Posts

Posted - 2006-01-24 : 07:23:26
Vw_RingTime has no record for an agent but Vw_IdleTime has the record for that agent but because of Vw_RingTime join specified before the Vw_IdleTime, the records are not displayed properly.

Njoy Life
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ditch
Master Smack Fu Yak Hacker

1466 Posts

Posted - 2006-01-24 : 07:38:59
Try FULL OUTER JOIN instead of LEFT OUTER JOIN

Duane.
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jsmith8858
Dr. Cross Join

7423 Posts

Posted - 2006-01-24 : 08:53:52
Join to the AgentId in your primary view listed in your FROM clause. And be sure that the view in your FROM clause is truly the one that you want to drive your results.

i.e.,

FROM Vw_LoggedInTime L
...
LEFT OUTER JOIN Vw_RingTime R ON N.AgentID=L.AgentID

Though this SELECT looks very suspect. unless all of those views returns 1 row per agentID, it looks like you will get lots of cross joins and duplicates.
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swatib
Posting Yak Master

173 Posts

Posted - 2006-01-24 : 23:58:48
quote:
Originally posted by jsmith8858

Join to the AgentId in your primary view listed in your FROM clause. And be sure that the view in your FROM clause is truly the one that you want to drive your results.

i.e.,

FROM Vw_LoggedInTime L
...
LEFT OUTER JOIN Vw_RingTime R ON N.AgentID=L.AgentID




Thanks a lot, actually I'm using Outer join first time....I'll keep this in mind when using Left Outer Join.
Thanks Jsmith8858

Njoy Life
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