I am trying to do an inner join between three tables.  Here is what I have 
tried:

select * from MapConfig LEFT JOIN ConfigString USING (id) LEFT JOIN ConfigInt 
USING (id) WHERE MapConfig.layername = "Roads";

What I am trying to do is to pull back all rows from MapConfig associated 
with matching rows from ConfigInt and ConfigString.  What I get, though, is 
info from MapConfig and ConfigString ONLY, nothing from ConfigInt.

If I rearrange the order that ConfigString and ConfigInt appear, I get info 
from MapConfig and ConfigInt ONLY, nothing from ConfigString.

Is my SQL messed up or is there a limitation in MySQL on the number of INNER 
JOINs you can do in one statement?  I suppose I could probably use a 
temporary table for this but I'd rather not.

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