def set_flag_sql(flag, value, colmn = nil, custom_table_name = table_name)
      colmn = determine_flag_colmn_for(flag) if colmn.nil?
      sql_set_for_flag(flag, colmn, value, custom_table_name)
    end
def set_flag_sql(flag, value, colmn = nil, custom_table_name = table_name)
      colmn = determine_flag_colmn_for(flag) if colmn.nil?
      sql_set_for_flag(flag, colmn, value, custom_table_name)
    end
Returns SQL statement to enable/disable flag.
 Automatically determines the correct column.