Question

In my database I have the following three tables with the fields listed:

TablePS 

 aID 

TableAM 

 aID(pk)
 bID  

TableM 

 bID(pk)
 bName 

If I know the aID in TablePS, how can I find the value of bName in TableM?
I have tried the following query:

SELECT bName FROM TableM WHERE bID=
(SELECT TablePS.aID,TableAM.aID 
FROM TablePS 
INNER JOIN TableAM 
ON TablePS.aID= TableAM.aID)

Answer 1

select bName
from tableM
    inner join tableAM on tableM.bID = tableAM.bID
where
    aID = [value]

should be sufficient.
If you need to join to table PS, then

select bName
from tableM
    inner join tableAM on tableM.bID = tableAM.bID
    inner join tablePS on tableAM.aID = tablePS.aID