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How to SELECT from foreign table where criteria matches or return a null but only joining on one null.

Posted on 2015-02-17
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Last Modified: 2015-02-17
Given
TableA
ID     Name
1         A
2         B
3         C
4         D
5         E

and

TableB
ID   CategoryID  
1        5
2        4
2        5
3        5
3        4
4        1
4        3
and joining the two tables above and applying some criteria somewhere in the selection of CategoryID = 5 I would like to get output column :

TableC
ID  Name  CategoryID  
1        A           5
2        B           5
3        C           5
4        D          null
5        E           null

Note that ID only returns once and basically we get the category id returned if there is a match but otherwise null.
I would prefer to avoid using grouping although you may say this is not possible.
Server is SQL server 2000
Thanks in advance!
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Question by:dgloveruk
2 Comments
 
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by:
Phillip Burton earned 500 total points
ID: 40613793
Select A.ID as ID, A.Name as Name, B.CategoryID as CategoryID
From TableA as A
left join (Select ID, CategoryID from TableB where CategoryID = 5) as B
on A.ID = B.ID
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Author Closing Comment

by:dgloveruk
ID: 40614069
That's great , thanks very much!
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