android - 获取sqlite android中数据的平均值

Question

我希望执行以下查询，

  String selectQuery = "SELECT  max(score),name FROM " + TABLE_SCORE
                        +" group by name";

我将输出作为随机值。实际上我想要从最大值到最小值的数据。请告诉我，如何编写查询。

Answer 1

实际上我想要从最大值到最小值的数据

你的意思是按最大值到最小值排序？试试这个：

  SELECT SUM(score), name 
    FROM MyTable
GROUP BY name
ORDER BY SUM(score) DESC;

看到这个 SQLFiddle

所以你的查询应该是这样的：

String selectQuery = "SELECT SUM(score), name FROM " + TABLE_SCORE
                        +" GROUP BY name ORDER BY SUM(score) DESC";

Answer 2

String selectQuery = "SELECT  score, name FROM " + TABLE_SCORE
                        +" order by score, group by name";

这将根据分数（分数的升序）为您提供记录。