Hi List,

I am a noob trying to do something that seems like it should be easy but I 
can't figure it out.

I have a table like so:

id | ref_id | sts
------------------
1  |        |  0
2  | 1      |  1
3  |        |  0
4  |        |  0
5  | 4      |  1
6  |        |  0
7  | 6      |  1

I want to find the max(id) whose sts is 0 but whose id is not referenced by 
ref_id.

so the answer would be id=3.

Thanks for any pointers,
Steve

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