How to Replace data in Access

I am trying to replace data in a particular field via Query.  I'm currently using the IIF([field] ="current data", "new data".  This works fine except for the fact that I have 30 different occurances of data in that particular field.  Query will not let me use that many IIF statements in a single query.  That wouldn't be a problem, I could run two queries except for the fact that the IIF statement blanks out the field if none of the occurances are matched.

  Is there a way using IIF to leave the existing data intact if it does not match any of the IIF statements?  If not, what's a better way to do this.

Here's a portion of the IIF statement I'm using:

SELECT IIf([Failure Code]="UM","Unscheduled Maintenance",IIf([Failure Code]="AL","Alignment",IIf([Failure Code]="CC",IIf([Failure Code]="CI","Customer Induced",IIf([Failure Code]="DE","Design",IIf([Failure Code]="DM","Deferred Maintenance",IIf([Failure Code]="GM","General Maintenance",IIf([Failure Code]="HA","Handling"

Who is Participating?
omgangConnect With a Mentor IT ManagerCommented:

PUblic Function ReplaceValue()

    Dim rs As DAO.Recordset
    Dim strNewVal As String

    Set rs = CurrentDb.OpenRecordset("MyTableName")
    Do Until rs.EOF
        Select Case rs([Failure Code])
            Case "UM"
                strNewVal = "Unscheduled Maintenance"

            Case "AL"
                strNewVal = "Alignment"


            Case Esle
                strNewVal = rs([Failure Code])

        End Select

            rs([Failure Code]) = strNewVal

    Set rs = Nothing
End Function

OM Gang
omgangConnect With a Mentor IT ManagerCommented:
The last Else part should be [Failure Code], e.g.  IIf([Failure Code]="UM","Unscheduled Maintenance", [Failure Code])
This way if none of the IIf parts match the field value will remain as it started.

OM Gang
Rey Obrero (Capricorn1)Connect With a Mentor Commented:
use this format

iif([fieldName]="GM","General Maintenance",[FieldName])

if the values are not find, use the value of the field
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omgangIT ManagerCommented:
You could also use a VBA routine to replace the values.
OM Gang
Dale FyeConnect With a Mentor Commented:
Use the Switch() function.  This accepts an array of pairs of information,  the first element is must evaluate to a logical true/false, the second element is the value to use if the first is encountered.

SELECT  Switch([Failure Code]="UM","Unscheduled Maintenance", _
                         [Failure Code]="AL","Alignment", _
                         [Failure Code]="CC", "you forgot to enter a value for this", _
                         [Failure Code]="CI","Customer Induced", _
                         [Failure Code]="DE","Design", _
                         [Failure Code]="DM","Deferred Maintenance", _
                         [Failure Code]="GM","General Maintenance", _
                         [Failure Code]="HA","Handling", _
                         True, [Failure Code]) as [Failure Desc]
FROM your Table

ckuderAuthor Commented:
Thank you for all the suggestions. You have all been a tremendous help.
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