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SQL Query help required

Posted on 2011-09-08
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Last Modified: 2012-05-12
Hi

I'm trying to return data from a SQL Server databae using the following query:

SELECT id,thing1,ISNULL(Monitor, 0) AS Monitor
FROM Things as t  
LEFT OUTER JOIN ThingRelationships as t  
ON t.ID=t.ChildDeviceID  
WHERE t.AccountID =1
AND r.ParentDeviceID= (27)

Where I want all the things with the account Id of 1 to be returned whether there is a record in the ThingRelationships table or not, with a ParentDeviceID=27.

I'd expect the following, for example.

id    thing1            Monitor
12   something     0
23   something     0
34   something     0
56   something     0
2     something     0
4     something     0
56   something     0
43   something     1

as 43 is currently the only one with a relationship.

Thanks in advance!


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Question by:Spike_66
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6 Comments
 
LVL 5

Accepted Solution

by:
zvytas earned 2000 total points
ID: 36501909
Try the following:

SELECT id,thing1,ISNULL(Monitor, 0) AS Monitor
FROM Things as t  left JOIN ThingRelationships as r ON t.ID=r.ChildDeviceID AND r.ParentDeviceID= (27)
WHERE t.AccountID =1
0
 
LVL 18

Expert Comment

by:deighton
ID: 36501964
you seem mixed up as to what t and r are, there seems to be 2 t's defined, but no r

try something like

SELECT id,thing1,ISNULL(Monitor, 0) AS Monitor
FROM Things as t  
LEFT OUTER JOIN ThingRelationships as r  
ON r.ID=t.ChildDeviceID  
WHERE t.AccountID =1
AND COALESCE(r.ParentDeviceID,27) = 27
0
 
LVL 9

Expert Comment

by:mimran18
ID: 36501985
Hi,
   Both the table is alias as "t". You need to change "Things as t  " or "ThingRelationships as t "
to as "r"
 
SELECT id,thing1,ISNULL(Monitor, 0) AS Monitor
FROM Things as t
LEFT OUTER JOIN ThingRelationships as rON t.ID=r.ChildDeviceID  
WHERE t.AccountID =1
AND r.ParentDeviceID= (27)
0
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Author Closing Comment

by:Spike_66
ID: 36502020
Easy when you know how!
0
 

Author Comment

by:Spike_66
ID: 36502091
Not that it matters now but

"...Things as t
LEFT OUTER JOIN ThingRelationships as r..."

both tables aren't define as t
0
 

Author Comment

by:Spike_66
ID: 36502102
Oops- sorry - you were right- both were t- my bad!
0

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