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Question about a query

Question about a query

Question about a query

Hello all, I was wondering how do to something.  I have a table that I need to do some kind of sub query.  I am learning so this query eill teach me a lot.  I have 2 columns One is the ID and the other is Num.  I need to search for all Nums that have a "0" in it and get the ID of that row.  I then need to search in the column "Num" and get match the row id.  I think this would be an embedded search (something like that).

Here is my columns.


ID     Num
2     0     
3     2     
4     2
I will attempt the query string:


select Num from table where Num = (select ID from Num where Num = 0 )
Something like that.  I want to learn how to do this kind of search.


-How important does a person have to be before they are considered assassinated instead of just murdered?

RE: Question about a query

select b.num
from table a
inner join table b
on a.id = b.num
where a.num = 0


RE: Question about a query

select Num from table where Num = (select ID from Num where Num = 0 )

in this case the sub query should result a single ID.(according to query)

select ID from table where Num IN (select ID from table where Num = 0 )

in this case the sub query should result multiple IDs.
(So it works fine)

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