access數據庫語句

1.判空
Access:
Nz
同Sql Server IsNull。只能在Access程序中使用,Jet ADO不支持
select userName,Nz(address,'無') from [user]... 


IIF
select userName,IIF(address is null,'無',address) from [user]... 


select userName,IIF(address is null,'沒寫','寫了') from [user]...