Question

我正在尝试查找介于0和该组平均值之间的每个分组行的人口百分比。例如，在下面的查询中，说我有一个行，其中num_problems为100，平均值为70。总体（该行）中有58个值，其值小于70。我想将值（58）提取为结果图钉的一部分。

select
    tm.subject_name,
    tm.topic_name,
    pm.problem_type,
    count( pa.id ) as num_problems,
    avg( pa.duration ) as average ,
    stddev( pa.duration )
from
    problem_attempt pa,
    problem_master pm,
    topic_master tm
where
    pa.problem_id = pm.id and
    pm.topic_id = tm.id and
    pa.outcome = 'Solved' and
    pa.duration > 10 and 
    pa.duration < 1000 and
    pm.problem_type = 'SCA'
group by
    tm.subject_name,
    tm.topic_name,
    pm.problem_type ;

Answer 1

从不在@section Scripts { @Scripts.Render("~/bundles/jqueryval") <script> function prideti(sk) { var tmp_row = `<tr> <td> @Html.EditorFor(model => model.dalyviai[0].vardas, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.dalyviai[0].vardas, "", new { @class = "text-danger" }) </td> <td> @Html.EditorFor(model => model.dalyviai[0].pavarde, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.dalyviai[0].pavarde, "", new { @class = "text-danger" }) </td> <td> @Html.EditorFor(model => model.dalyviai[0].telefonas, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.dalyviai[0].telefonas, "", new { @class = "text-danger" }) </td> <td> @Html.EditorFor(model => model.dalyviai[0].el_pastas, new { htmlAttributes = new { @class = "form-control" } }) @Html.ValidationMessageFor(model => model.dalyviai[0].el_pastas, "", new { @class = "text-danger" }) </td> <td> @Html.DropDownListFor(model => model.dalyviai[0].fk_projektas, Model.projektaiList, "--------------", new { @class = "form-control" }) @Html.ValidationMessageFor(model => model.dalyviai[0].fk_projektas, "", new { @class = "text-danger" }) </td> </tr>`; $("#kainos_tbl tr:last").after(tmp_row); $('#hCount').val(Number($('#hCount').val()) + 1); $(".date-picker").datepicker({ dateFormat: 'yy-mm-dd' }); }; ``子句中使用逗号。始终使用正确的，明确的，标准 FROM语法。

您需要聚合两次或使用窗口函数。

我建议：

JOIN

SQL-查找介于0和平均人口之间的百分比人口

1 个答案: