errorjava.sql.SQLException:列'；临时秘书处'；找不到

这是我的表格： 表名：player。所有数据类型都是float

id      | pts  | gp
0       | 45   | 5
1       | 13   | 6
2       | 74   | 10

我想选择点的平均值。下面是我在连接到db后单击按钮时使用的函数

public float getavgstats() {
 float ptsavg = 0;


 try {
  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery("select (cast((pts/gp) as decimal(10,2))) as ppg from player order by ppg desc");
  while (rs.next()) {
  ptsavg = rs.getFloat("pts");
  System.out.println(ptsavg);
 }
} catch (Exception ex) {
 System.out.println("error" + ex);
}
return ptsavg;
}
}

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我得到一个错误，没有找到列“pts”

您的查询只返回一列-

ppg

，它没有

pts

列

如果要查询，应将其添加到查询中：

ResultSet rs = stmt.executeQuery(
    "select pts, (cast((pts/gp) as decimal(10,2))) as ppg " +
    // Here-^
    "from player order by ppg desc");

---

您的结果集只包含

ppg

字段。请尝试

ptsavg=rs.getFloat（“ppg”）