Question

如何计算一个百分比？在尝试根据行数计算百分比时，我得到了所有相同的值。我想要每个属性的百分比取决于COUNT的数量。因此，如果我将属性计数30次，我希望将其更改为百分比，具体取决于行数和其他值。

SELECT  Attribute
      , COUNT(Attribute) / COUNT(*) * 100 AS TopIssues
FROM    Audits 
        WHERE MONTH(TransActionDate) = MONTH(GETDATE())
GROUP BY Attribute
ORDER BY COUNT(Attribute) DESC

Answer 1

在SQL Server中，您可以使用：

SELECT  Attribute
      , COUNT(Attribute)*1.0 / SUM(COUNT(*)) OVER() * 100 AS TopIssues
FROM    Audits 
WHERE MONTH(TransActionDate) = MONTH(GETDATE())
GROUP BY Attribute
ORDER BY COUNT(Attribute) DESC

Answer 2

您也可以这样做：

SELECT  Attribute
      , COUNT(Attribute)*1.0 / ACount AS TopIssues
FROM    Audits 
CROSS JOIN (SELECT COUNT(1) ACount FROM Audits) ACount
WHERE MONTH(TransActionDate) = MONTH(GETDATE())
GROUP BY Attribute, ACount
ORDER BY COUNT(Attribute) DESC

Count SQL的百分比

2 个答案: