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[±Ð¾Ç] Nz(),ªÅ­È¸É¤W¹s¦r¦ê "0"

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IIf(Is Null(field)=True,0,field) ©Î IIf(field Is Null,0,field)

SQL:
select IIf(Is Null(field),0,field)
from table

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