code: private void deleteStyleRelationship(String mappingTableName,
  			String featureTable) {
  
  		relatedTables.removeRelationshipsWithMappingTable(mappingTableName);
  
  		if (!hasRelationship(featureTable)) {
  			try {
  				if (extensionsDao.isTableExists()) {
  					extensionsDao.deleteByExtension(EXTENSION_NAME,
  							featureTable);
  				}
  			} catch (SQLException e) {
  				throw new GeoPackageException(
  						"Failed to delete Feature Style extension. GeoPackage: "
  								+ geoPackage.getName() + ", Feature Table: "
  								+ featureTable, e);
  			}
  		}
  
  	}
docs: Delete a style extension feature table relationship and the mapping table
  
  @param mappingTableName
  mapping table name
  @param featureTable
  feature table name