'Return the first part of a generic sql select query.'

def get_sql_header(self):

    _columns = u'tx,    public_key,    sequence_number,    link_public_key,    link_sequence_number,    previous_hash,    signature,    insert_time'
    return ((u'SELECT    ' + _columns) + (u'    FROM    %s    ' % self.db_name))
