code: @Override
      public boolean existsSequence(final Connection _con,
                                    final String _name)
          throws SQLException
      {
          return existsTable(
                  _con,
                  new StringBuilder().append(MySQLDatabase.PREFIX_SEQUENCE).append(_name.toLowerCase()).toString());
      }
docs: Checks if the related table representing sequence <code>_name</code>
  exists.
  
  @param _con          SQL connection
  @param _name         name of the sequence
  @return <i>true</i> if a table with name as concatenation of
  {@link #PREFIX_SEQUENCE} and <code>_name</code> (in lower case)
  representing the sequence exists; otherwise <i>false</i>
  @throws SQLException if check for the existence of the table
  representing the sequence failed
  @see #existsTable(Connection, String)
  @see #PREFIX_SEQUENCE