How to put IIF expression

[zyus]

I have this data in my tblsk

LA UN
10000 0
10000 5000
10000 10000

How to write an iif function if

UN = 0 ,"FD"
UN = LA,"ND"
UN >0<LA,"PD"

Thanks

 

[RonaldoOneNil]

IIf([UN]=0,"FD",IIf([UN]=[LA],"ND",IIf([UN]>0 And [UN]<[LA],"PD","")))

 

[De Jager]

I have this data in my tblsk

LA UN
10000 0
10000 5000
10000 10000

How to write an iif function if

UN = 0 ,"FD"
UN = LA,"ND"
UN >0<LA,"PD"

Thanks