Question

我将日期和时间存储在DATETIME类型的列中。在那之后，我试图找回最早的时间。我正在使用此查询

String query_to_fetch_earliest="select *  from "+TABLE_NAME+" order  by datetime("+KEY_DATETIME+") DESC LIMIT 1";
    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(query_to_fetch_earliest, null);

但我总是最终获得第一排。请帮忙。

Answer 1

不要设置限制，只需按以下步骤

  String query_to_fetch_earliest="select *  from "+TABLE_NAME+" order  by         datetime("+KEY_DATETIME+") DESC ";
  SQLiteDatabase db = this.getWritableDatabase();
  Cursor cursor = db.rawQuery(query_to_fetch_earliest, null);

Answer 2

试试这个：

String query = "SELECT * FROM " +
  TABLE_NAME +
  " WHERE " + 
  KEY_DATETIME +
  " IN (SELECT max(" +
  KEY_DATETIME +
  ") FROM " +
  TABLE_NAME +
  ")"

android sqlite orderby datetime总是取第一行

2 个答案: