Question

我有一个看起来像这样的查询：

SELECT dbo.music_styles.music, (COUNT(dbo.people.id)* 100.00 / (SELECT SUM(dbo.people.id)))  AS nbStyle
FROM dbo.people_music_styles
INNER JOIN dbo.music_styles ON dbo.music_styles.id = dbo.people_music_styles.id_music_styles
WHERE dbo.people.age BETWEEN @age_min and @age_max 
AND dbo.people.gender = @gender
GROUP BY dbo.music_styles.music
ORDER BY nbStyle DESC

在响应中，我得到一个包含两列的数组：

带有样式名称的人（感谢加入）
另一列，其中包含有关我设置的参数的样式出现在关系表中的次数。

我想要第三列，其中第三行的值与该列的总数/总和以及样式显示的次数有关。

Answer 1

由于这将需要分数，因此请务必进行转换，以免截断为整数：

(COUNT(DISTINCT dbo.music_styles.id) / CONVERT(FLOAT, COUNT(SELECT SUM(dbo.music_styles) FROM dbo.music_styles))) * 100

让我知道这是否行得通，否则，我很乐意进一步探索。

Answer 2

@CarlosBos我终于设法通过您的提案的一部分找到了可行的答案！这是代码：

SELECT dbo.music_styles.music, COUNT(dbo.people.id) AS peopleID, CONVERT(FLOAT, ROUND(COUNT(dbo.people.id)* 100.00 / SUM(COUNT(dbo.people.id)) OVER (), 2)) AS Répartition
FROM dbo.people_music_styles
INNER JOIN dbo.people ON dbo.people.id = dbo.people_music_styles.id_people
INNER JOIN dbo.music_styles ON dbo.music_styles.id = dbo.people_music_styles.id_music_styles
WHERE dbo.people.age BETWEEN @age_min and @age_max 
AND dbo.people.gender = @gender
GROUP BY dbo.music_styles.music
ORDER BY peopleID DESC

非常感谢！

与SQL中的列总和相关的每一行的百分比值

2 个答案: