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Limiting a query based on entries in a table?

Posted on 2008-10-29
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Last Modified: 2012-05-05
I have the following:

Select O.ID,O.EndDate,fs.fieldid,fs.type,fs.fieldvalue,fs.description
from Objects O
Inner JOIN metadata fs on fs.ID = O.ID
Inner JOIN DestructionList MS ON  ms.ID = O.ID
where O.Status = 5 AND MS.ID IS NOT NULL AND fs.Type = 'DataTable'

I have 3 tables

Objects
Metadata
DestructionList

The destructionlist tracks the ObjectID and a value for that object which is to be detroyed.

Objects & MetaData stores information.

So what I am trying to do is to join

Objects & MetaData where ID's match

and then join DestructionList where the ID or the Value are not contained within the destructionlist. There are instances where I may have multiple ObjectID's which are the same, but the value's are different, so I need to make sure that I show objects which are not in the destructionlist.

Any help would be much appreciated.
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Question by:directxBOB
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2 Comments
 
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Accepted Solution

by:
jfmador earned 500 total points
ID: 22833338
if you want to get the Objects that are not in DestructionList, you can use a left join between the two table and after the join get only the rows where your DestructionListID is null

Select O.ID,O.EndDate,fs.fieldid,fs.type,fs.fieldvalue,fs.description
from Objects O
Inner JOIN metadata fs on fs.ID = O.ID
LEFT JOIN DestructionList MS ON  ms.ID = O.ID
where O.Status = 5 AND MS.ID IS NULL AND fs.Type = 'DataTable'
0
 

Author Comment

by:directxBOB
ID: 22839010
Select O.ID,O.EndDate,fs.fieldid,fs.type,fs.fieldvalue,fs.description
from Objects O
Inner JOIN metadata fs on fs.ID = O.ID
LEFT JOIN DestructionList MS ON  ms.ID = O.ID and MS.fieldId = fs.FieldID
where O.Status = 5 AND MS.FieldID IS NULL AND fs.Type = 'DataTable'

Cheers for the help, I was just missing two parts. One in the left join where I am joining on both fields, and then in the where .

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