Android SimpleDB-子查询还是嵌套的select语句？

我试图在Amazon SimpleDB中实现以下查询，但得到InvalidQueryExpression，AWS错误消息：指定的查询表达式语法无效

SelectRequest selectRequest = 
   new SelectRequest("select itemName() from Quotes where name = '" + 
      myName + 
      "' and name in (select followedName from Following)");

子查询或嵌套选择是否不受SimpleDB支持？那么，我怎样才能在切换数据库的情况下完成这样的任务呢？

所以我发现它不支持子查询。以下是我使用的解决方法：

SelectRequest selectRequestNames = new SelectRequest("select followedName from Following where followedBy = '" + myName + "'").withConsistentRead(true);
List<Item> names = getInstance().select(selectRequestNames).getItems();

String set = "(";
for (int j = 0; j < names.size(); j++) {
    set += "'" + names.get(j).getAttributes().get(0).getValue() + "',";
}
set = set.substring(0, set.length() - 1) + ")";

SelectRequest selectRequest = new SelectRequest("select itemName() from Quotes where fbName in " + set + " and timestamp is not null order by timestamp desc").withConsistentRead(true);

SelectRequest-selectRequestNames=new-SelectRequest（“从下面选择followdname，其中followdby='“+myName+””）。使用ConsistentRead（true）；
列表名称=getInstance（）.select（selectRequestNames）.getItems（）；
字符串集=“（”；
对于（int j=0；j