需要计算 SQL Query 中总计数的百分比 [英] Need to calculate percentage of total count in SQL Query

问题描述

我有一个表格，其中有两列，一个是日期时间列 (Test_Complete)，另一个是字母数字记录 ID 列 (RecordID).

I have a a table where I have two columns, one is a Date Time column (Test_Complete) and another is alphanumeric Record ID column (RecordID).

我需要准备每月处理的记录 ID 计数.我已经为此创建了一个查询.

I need to prepare a count of recordIDs which were processed on a monthly basis. I have already created a query for that.

SELECT (Format([Test_Complete],"mmm"" '""yy")) AS Evaluation_Month, 
Count(tbl_TestStatus.Record_ID) AS CountOfRecord_ID
FROM tbl_TestStatus
WHERE (((tbl_TestStatus.[Test_Complete]) Is Not Null))
GROUP BY (Format([Test_Complete],"mmm"" '""yy")),
(Year([Test_Complete])*12+Month([Test_Complete])-1);

此查询运行良好，并为我提供如下输出:

This query works well and gives me output like this:

Evaluation_Month     CountOfRecord_ID
------------------   -----------------
 Jan'12                   20
 Feb'12                   90
 Mar'12                   40
 Apr'12                   50

现在我需要的是计算 CountOfRecord_ID 值相对于每个 Evaluation_Month 的百分比，并将该百分比附加到 Evaluation_Month 数据中的值.

Now what I need is to calculate the percentage of CountOfRecord_ID value against each Evaluation_Month and append the percentage with the value in Evaluation_Month data.

在上面的结果集中，所有 CountOfRecord_ID 的总和为 200.因此需要将 200 视为 100% 来计算百分比，这样我的结果看起来像这样:

In the above resultset, the sum of all the CountOfRecord_ID is 200. so the percentage needs to be calculated considering 200 as 100%, such that my result looks like this:

Evaluation_Month     CountOfRecord_ID
------------------   -----------------
 Jan'12 (10%)                20
 Feb'12 (45%)                90
 Mar'12 (20%)                40
 Apr'12 (25%)                50

如何修改我的 SQL 查询以实现此目的?

How can I modify my SQL query to achieve this?

推荐答案

您只需要在您的 select 语句中添加一个子查询字段"和记录总数.像这样:

You only need to add a "subquery field" in your select statement with the total count of records. Something like this:

SELECT 
    (Format([Test_Complete],"mmm"" '""yy")) AS Evaluation_Month, 
    Count(tbl_TestStatus.Record_ID) AS CountOfRecord_ID,
    Count(tbl_TestStatus.Record_ID) / (select count(tbl_testStatus.recordId
     from tbl_testStatus
     where tbl_testStatus.test_complete is not null) as percent
FROM 
    tbl_TestStatus
WHERE 
    (((tbl_TestStatus.[Test_Complete]) Is Not Null))
GROUP BY 
    (Format([Test_Complete],"mmm"" '""yy")),
    (Year([Test_Complete])*12+Month([Test_Complete])-1);

这篇关于需要计算 SQL Query 中总计数的百分比的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！