IF IS NULL then SINGLE else keep the value of the field

Question

I am working with a DB in Access and I'd like to be able to fill the field in this row with a result of SINGLE if it is not already filled with another value.

I wrote Iif(MaritalStatus) is null, "SINGLE") but Access returned a result in which all of the fields were filled with SINGLE except those that had had a previous value of Married, Divorced, etc.

Answer 1

Try:

NZ(MaritalStatus,"SINGLE")

From Nz Function in the documentation:

You can use the Nz function to return zero, a zero-length string (" "), or another specified value when a Variant is Null. For example, you can use this function to convert a Null value to another value and prevent it from propagating through an expression.

Or you can use:

IIF(IsNull(MaritalStatus),"SINGLE",MaritalStatus)