I need help with rewriting a sql query.  Nested queries that work in MS
databases apparently do not work in MySQL databases.  Here is what I need
in MS query pseudo code:

SELECT table1.myfield1, table2.myfield2 
FROM table1, table2  
WHERE table1.key=table2.key AND myfield1="something" 
AND myfield2 NOT IN 
(SELECT myfield2 FROM table3 WHERE table3.myfield3="whatever")

For example, if I wanted to get all Forum Posts (Table1)  for TopicA that
do NOT have replies (Table3) by User1.

I have been going crazy trying joins - lefts, rights, inners, outers... 
Any help would be greatly appreciated!!  

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