code: public String getSchemaName(int column) throws SQLException {
  
          checkColumn(column);
  
          String name = resultMetaData.columns[--column].getSchemaNameString();;
  
          return name == null ? ""
                              : name;
      }
docs: <!-- start generic documentation -->
  Get the designated column's table's schema.
  <!-- end generic documentation -->
  
  <!-- start Release-specific documentation -->
  <div class="ReleaseSpecificDocumentation">
  <h3>HSQLDB-Specific Information:</h3> <p>
  
  Since 1.8.0.x, HSQLDB implements standard SQL SCHEMA support;
  this method returns the actual schema of the column's table.
  Columns generated in queries have no schema name.
  </div>
  <!-- end release-specific documentation -->
  
  @param column the first column is 1, the second is 2, ...
  @return schema name or "" if not applicable
  @exception SQLException if a database access error occurs