code: public void addUniqueKeyColumn(final String _ukName,
                                     final int _colIndex,
                                     final String _colName)
      {
          final String ukName = _ukName.toUpperCase();
          final UniqueKeyInformation uki;
          if (!this.ukMap.containsKey(ukName))  {
              uki = new UniqueKeyInformation(_ukName);
              this.ukMap.put(ukName, uki);
          } else  {
              uki = this.ukMap.get(ukName);
          }
          uki.appendColumnName(_colIndex, _colName);
  
  //        this.ukColMap.put(uki.getColumnNames(), uki);
      }
docs: Adds an unique key information to this table information.
  
  @param _ukName   name of unique key
  @param _colIndex index of the column for given unique key
  @param _colName  name of the column for given unique key
  @see #ukMap
  @see #ukColMap