Question

我正在尝试查看表中的唯一值，并根据从不同查询返回的n个值，将这些值传递到 WHERE 子句中的后续查询中。

让我举个例子。

我有一个包含以下列的表：

ID | UserName | OtherCondition

我通常计算总记录，与其他条件上的 WHERE 条款相匹配的记录及其相关百分比，如下：

SELECT 'Report' as ReportName,
COUNT(*) Match, 
(SELECT COUNT(*) FROM [MyTable) Total,
CAST(COUNT(*) AS FLOAT)/CAST((SELECT COUNT(*) FROM [MyTable]) AS FLOAT)*100 Percentage
FROM [MyTable]   
WHERE OtherCondition = MyCondition

现在，我正在尝试将UserName列集成到此查询中。我的意思是，我将通过上面的表格查看并获取所有记录的所有唯一用户名（这也可能是空/空）。此用户名将在上面传递给 ReportName （目前是字符串文字）（格式为＆＃39;报告 - ＆＃39; [用户名]），这也是传递到第二个WHERE条件。总体而言，WHERE条件将如下所示：

WHERE OtherCondition = MyCondition AND UserName = [The Passed in unique username, from the not yet defined query]

基本上，这将允许我找到所有唯一用户，并提供基于用户的报告。

一些示例数据：

ID | UserName | OtherCondition
1    Mary         X
2    John         X
3    Mary         X

预期结果：

 SELECT 'Report - Mary' as ReportName,
    COUNT(*) Match, 
    (SELECT COUNT(*) FROM [MyTable) Total,
    CAST(COUNT(*) AS FLOAT)/CAST((SELECT COUNT(*) FROM [MyTable]) AS FLOAT)*100 Percentage
    FROM [MyTable]   
    WHERE OtherCondition = x AND UserName = 'Mary'


 SELECT 'Report - John' as ReportName,
    COUNT(*) Match, 
    (SELECT COUNT(*) FROM [MyTable) Total,
    CAST(COUNT(*) AS FLOAT)/CAST((SELECT COUNT(*) FROM [MyTable]) AS FLOAT)*100 Percentage
    FROM [MyTable]   
    WHERE OtherCondition = x AND UserName = 'John'

Answer 1

希望我理解你想要的东西：

SELECT ('Report - '+ UserName) as ReportName, 
       COUNT(*) Match, (SELECT COUNT(*) FROM [MyTable]) Total,
       CAST(COUNT(*) AS FLOAT) /
         CAST((SELECT COUNT(*) FROM [MyTable]) AS FLOAT)*100 Percentage
FROM [MyTable]   
WHERE OtherCondition = x
GROUP BY UserName;

此查询提供帖子最后两个查询的输出。

选择不同的值，传入Where子句

1 个答案: