The following code example uses a RelQueryTable to join a Table to a FeatureClass . It then prints the names of the fields in the RelQueryTable.

[Visual Basic 6.0]
Private Sub RelQryTabExample(pFCls As IFeatureClass, strFClsFld As String, pTable As ITable, strTabFld As String)

  ' ++ Create the MemoryRelationshipClass that defines what is to be joined
  Dim pMemRelClassFact As IMemoryRelationshipClassFactory
  Set pMemRelClassFact = New MemoryRelationshipClassFactory
  Dim pRelClass As IRelationshipClass
  Set pRelClass = pMemRelClassFact.Open("Country_Demog", pFCls, _
  strFClsFld, pTable, strTabFld, "forward", "backward", esriRelCardinalityOneToMany)

  ' ++ Perform the join   
  Dim pRelQueryTableFact As IRelQueryTableFactory
  Dim pRelQueryTab As ITable
  Set pRelQueryTableFact = New RelQueryTableFactory
  Set pRelQueryTab = pRelQueryTableFact.Open(pRelClass, True, Nothing, Nothing, "", True, True)

  ' ++ Print the fields  
  Dim pCursor As ICursor
  Set pCursor = pRelQueryTab.Search(Nothing, True)
  
  Dim pField As IField
  Dim pFields As IFields
  Dim intI As Integer, intJ As Integer
  
  Set pFields = pCursor.Fields
  intI = pFields.FieldCount - 1
  For intJ = 0 To intI
    Set pField = pFields.Field(intJ)
    Debug.Print pField.Name
  Next intJ
End Sub

[Visual Basic .NET, C#, C++]
No example is available for Visual Basic .NET, C#, or C++. To view a Visual Basic 6.0 example, click the Language Filter button in the upper-left corner of the page.