This example sets the Unique property of a new Index object to True, and appends the Index to the Indexes collection of the Employees table. It then enumerates the Indexes collection of the TableDef and the Properties collection of each Index. The new Index will only allow one record with a particular combination of Country, LastName, and FirstName in the TableDef.
Sub UniqueX()
Dim dbsNorthwind As Database
Dim tdfEmployees As TableDef
Dim idxNew As Index
Dim idxLoop As Index
Dim prpLoop As Property
Set dbsNorthwind = OpenDatabase("Northwind.mdb")
Set tdfEmployees = dbsNorthwind!Employees
With tdfEmployees
' Create and append new Index object to the Indexes
' collection of the Employees table.
Set idxNew = .CreateIndex("NewIndex")
With idxNew
.Fields.Append .CreateField("Country")
.Fields.Append .CreateField("LastName")
.Fields.Append .CreateField("FirstName")
.Unique = True
End With
.Indexes.Append idxNew
.Indexes.Refresh
Debug.Print .Indexes.Count & " Indexes in " & _
.Name & " TableDef"
' Enumerate Indexes collection of Employees table.
For Each idxLoop In .Indexes
Debug.Print " " & idxLoop.Name
' Enumerate Properties collection of each Index
' object.
For Each prpLoop In idxLoop.Properties
Debug.Print " " & prpLoop.Name & _
" = " & IIf(prpLoop = "", "[empty]", prpLoop)
Next prpLoop
Next idxLoop
' Delete new Index because this is a demonstration.
.Indexes.Delete idxNew.Name
End With
dbsNorthwind.Close
End Sub