Need to add a 3rd table to this join

The following code works fine.
But I need to add that we only want part# that have a reporting code that is, are not blank in this table
and then we need to sort by that as well.

select ItQty#,IhDocd,ItPRT# from pklib.Fileout1 a        
                     join astdta.icEct1 b on              
b.CtCom#= a.ItCom# and                                    
b.CtCtr# = ' '     and                                    
b.CtPrt# =a.ItPrt#                                        
order by a.ItPRT#
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Anthony PerkinsCommented:
Do you want to provide us some details regarding this 3rd table?
sorry, I'm not clear

is the table: IAPRT#
and the field to sort by: IARCC9
when you say blank do you mean NULL or is it an "empty string"?

& I don't see information on how a third table joins to either of the existing tables

     , IhDocd
     , ItPRT#
FROM pklib.Fileout1 a
INNER JOIN astdta.icEct1 b ON b.CtCom# = a.ItCom#
     AND b.CtCtr# = ' '
     AND b.CtPrt# = a.ItPrt#

INNER JOIN IAPRT# ON ?????????????????
AND IAPRT#.IARCC9 is not null -- is not blank
AND IAPRT#.IARCC9 <> '' -- is not an "empty string"

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