SQL 百分比 - 條件總和

Question

我想根據應用語言計算流失百分比並保留值。 我正在使用雪花。

我目前的情況如下：

SELECT i.language, lb.churn_status, SUM(lb.total_users) AS user_count
FROM level_based_churn_retain_comparison AS lb
    INNER JOIN sessions AS s
    ON s.level_index=lb.level_index
        INNER JOIN installs AS i
        ON s.user_id=i.user_id

GROUP BY i.language, lb.churn_status
ORDER BY i.language, user_count

輸出是

language churn_status user_count

Answer 1

因此，有了這個非常有想象力的數據（我在 CTE 中擁有的數據讓我很容易）

with level_based_churn_retain_comparison(level_index, total_users, churn_status) as (
    select * from values
    (10, 100, 'a'),
    (20, 400, 'a'),
    (30, 300, 'a')
), installs(user_id, language) as (
    select * from values
    (1, 'en'),
    (2, 'en'),
    (3, 'fr')
), sessions(user_id, level_index) as (
    select * from values
    (1, 10),
    (2, 20),
    (3, 30)
)

你的 SQL + RATIO_TO_REPORT

SELECT 
    i.language, 
    lb.churn_status, 
    SUM(lb.total_users) AS user_count,
    100.0 * ratio_to_report(user_count) over() as percent_churn
FROM level_based_churn_retain_comparison AS lb
INNER JOIN sessions AS s
    ON s.level_index = lb.level_index
INNER JOIN installs AS i
    ON s.user_id = i.user_id
GROUP BY i.language, lb.churn_status
ORDER BY i.language, user_count

我們得到：

語	CHURN_STATUS	USER_COUNT	PERCENT_CHURN
zh	一個	500	62.5
FR	一個	300	37.5

現在，如果您希望百分比為每個 churn_status，我們可以將其放入 PARTITION BY 子句中，如下所示：

with level_based_churn_retain_comparison(level_index, total_users, churn_status) as (
    select * from values
    (10, 100, 'a'),
    (20, 400, 'b'),
    (30, 300, 'a')
), installs(user_id, language) as (
    select * from values
    (1, 'en'),
    (2, 'en'),
    (3, 'fr')
), sessions(user_id, level_index) as (
    select * from values
    (1, 10),
    (2, 20),
    (3, 30)
)
SELECT 
    i.language, 
    lb.churn_status, 
    SUM(lb.total_users) AS user_count,
    100.0 * ratio_to_report(user_count) over(partition by lb.churn_status) as percent_churn
FROM level_based_churn_retain_comparison AS lb
INNER JOIN sessions AS s
    ON s.level_index = lb.level_index
INNER JOIN installs AS i
    ON s.user_id = i.user_id
GROUP BY i.language, lb.churn_status
ORDER BY i.language, user_count

給予：

語	CHURN_STATUS	USER_COUNT	PERCENT_CHURN
zh	一個	100	25
zh	b	400	100
FR	一個	300	75