code: public static Object firstCell(String query, Object... params) {
          return new DB(DB.DEFAULT_NAME).firstCell(query, params);
      }
docs: Returns a value of the first column of the first row.
  This query expects only one column selected in the select statement.
  If more than one column returned, it will throw {@link IllegalArgumentException}.
  
  @param query query
  @param params parameters
  @return fetched value, or null if query did not fetch anything.