microsoft opening query seen duty perspective visible studio 2005


i have microsoft access database query i'm perplexing import visual studio 2005 dataset.



when query shaped controlling an nz() duty this:



select nz(tblcomponentspecs.npurchasecostquantity, 0) quantity
from tblcomponentspecs;


it appears underneath functions list information connection.



however, query shaped controlling an iif() duty this:



select iif(tblcomponentspecs.npurchasecostquantity null, 0, npurchasecostquantity) quantity
from tblcomponentspecs;


it appears underneath views list.



can anyone greatfully explain why?



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